四川新闻网首页
四川 | 原创| 国内| 国际| 娱乐| 体育| 女性| 图片| 太阳鸟时评| 市州联播| 财经| 汽车| 房产| 旅游| 居家| 教育| 法制| 健康| 食品| 天府新区| 慢耍四川
您当前的位置:四川新闻  >  本网原创

铁四局一处襄樊医院营业时间赶集新闻襄阳一院治疗直肠炎怎么样

2019年09月19日 08:54:58
来源:四川新闻网
预约信息

Yael: I was walking my cocker spaniel this morning, and we ran into two other dogs---a great dane almost as tall as I am, and a tiny Chihuahua! I cant believe they are all the same species! 今天早上我在遛的时候碰到了两只其他的——一只是跟我差不多高的大丹犬,还有一只小吉娃娃。简直不能相信他们属于同一物种!Don: You know, scientists are making great strides in understanding the genes that allow such a wide range of shapes, sizes and personalities in different dog breeds. 你知道的,科学家们在探索基因方面已经取得了长足进展,在研究这些不同形状,不同大小,不同性格特点的不同的种类的基因。Did you know domestic dogs were bred from wolves about 15,000 years ago? 你知道国内的是由一万五千年前的狼繁衍而来的吗?Y: Thats pretty recent in evolutionary terms, isnt it? 从进化的角度来讲,那就是近些年的事儿,不是吗?D: Very! Humans have sped up the diversification of dogs by selecting for particular physical or behavioral traits such as size, coat type, trainability, and hunting or herding ability. 太对了。人类通过选择特定的生理和行为特征,如大小、外观、是否可训练性和狩猎型或放牧的能力,已经加快了种的多样化。But dogs still show greater variety than any other domesticated animal, and for a long time this variance has largely been unexplained. 但是相比其他家养动物而言,显示出更明显的多样性,并且在很长的一段时间内,人们无法解释这种多样性。A group of genetics researchers collaborated with dog breeders and veterinarians to study the DNA from 148 different dog breeds. 一个基因研究小组与的饲养者和兽医合作研究了来自148个不同品种的DNA。With such a large sample of genes from very different kinds of dogs, they were able to identify regions in the dog DNA that are important in regulating some key traits that differ between breeds. 在来自不同的的DNA大样本的研究下,他们鉴定出DNA中的区域特征在决定的某些区别与其他的关键特征方面有着至关重要的作用。Four regions were found that may regulate life span, a breed characteristic that usually decreases with increasing body size. 有四个区域可以调节寿命,而且品种的特性会随着体型的变大而逐渐消失。Regions associated with some behavioral stereotypes like herding, pointing and boldness were also identified. 而且也确认了那些和固有品性相关的区域,像是放牧,勾缝以及大胆尝试。Y: What can they do with this information? 他们会拿这些信息做什么?D: The study could have far-reaching benefits for dogs and their owners. 这项研究对于和他们的主人都是有深远影响的。With further research, dog owners and vets could use this information to customize the care, diet and medicines to the particular needs of their breed, and to identify and perhaps prevent breed-specific diseases. 进一步研究会得出,主人和兽医可以凭此信息对有特定需求的定制保健,饮食和药物,并识别同时也可能会防治特种的疾病。201308/253152襄阳市四院男科挂号襄樊第一人民医院引产怎么样Reproductive technology生殖技术Mum, Dad and Mitomum妈妈,爸爸与妈妈Britain may allow babies with three biological parents英有望允许新生儿有三个亲身父母ASSISTED reproduction is one of those rare areas in which Britain really does do world-leading research. Louise Brown, the worlds first “test-tube” baby, was born in an Oldham hospital in 1978. In-vitro fertilisation, the technique that resulted in her conception, was pioneered by Robert Edwards and Patrick Steptoe, two British doctors. In 2010 Mr Edwards was awarded the Nobel prize in medicine for his work.英国在辅助生殖技术这个十分小众的研究领域中的确达到了世界领先水平,1978年作为世界首例“试管婴儿”的路易斯·布朗就出生于英国奥尔德姆医院。体外受精胚胎移植,也是其受成功的关键技术,是由两位英国医生罗伯特·爱德华和帕特里克·斯特普托率先开创的。2010年爱德华士还因此被授予了诺贝尔医学奖。Now the government is pondering another first. On June 3rd the Human Fertilisation and Embryology Authority, which regulates assisted reproduction, opined that, as far as it could see, there was no evidence to suggest that a genetic-engineering technique called “mitochondrial transfer” was unsafe.如今政府正考虑开创另一个第一。6月3日负责监管辅助繁殖技术的人类受精与胚胎指出,就目前看来,并没有据显示一种称作“线粒体转移”的基因工程技术是不安全的。The technology, which was pioneered in Britain and America, is designed to cure the roughly one baby in 6,500 that would otherwise be born with a serious, untreatable mitochondrial illness. But it has caused a stir, for two reasons. Children born via the technique would have three genetic parents. And, if approved, it would be the first time that any country has allowed a genetically engineered change that could be passed on to the offspring of the person on whom it was performed.由英国和美国率先提出的这项技术是被用来治疗那些可能一出生就患有某种严重的、无法医治的线粒体疾病的宝宝,而这种情况在6500个宝宝中大约会发生一例。但是,该技术的提出却引起了轰动,造成轰动的原因有两个。首先,通过该技术出生的孩子将会有三个遗传上的父母。其次,如果这项技术被批准,这将是首例有国家认可的技术,即基因因转基因工程发生改变的人,可以把转基因后的特征遗传给后代。Mitochondria are tiny structures, present in almost every cell in the body, that convert food and oxygen into energy. They are the descendants of ancient bacteria which gave up their free-living lifestyle to form a symbiotic relationship with other cells. As such, they have their own tiny genomes, independent from the DNA in the cells nucleus. Unlike that nuclear DNA, which is inherited from a childs father and mother, every mitochondrion in a persons body is descended from those inside his mothers egg.线粒体是微型结构,几乎存在于身体中的每一个细胞中,能够将食物和氧气转化为能量。他们是远古细菌的后代,远古细菌放弃了他们独立生存的方式职位与其他细胞形成一种共生的关系。因此,他们有自己的微型基因组,独立于细胞核中的DNA。不同于核DNA是遗传自父母亲的,人类身体中的每一个线粒体出身于其母亲卵子中的线粒体。The idea is to give a baby with misfiring mitochondria a fresh set donated by another woman. That involves removing the nucleus of the fertilised egg and transplanting it into a second, donor, egg which contains properly-functioning mitochondria.该理论就是给缺少有效线粒体的婴儿换上由另一位女士捐献的一套充满活力的线粒体基因组。其过程包括将受精卵核移除,并将其移植至第二个包含了正常运作线粒体的捐献者的卵子上。The resulting child would inherit roughly 20,000 genes-worth of nuclear DNA from its mother and father, and exactly 37 mitochondrial genes from the egg donor. In other words, it would inherit its genetic information from three people. And because those same donated mitochondria would find their way into a female childs eggs, the procedure would alter the DNA of her children in turn.最终诞生的孩子将遗传到来自其父母的约2000个有遗传价值的核DNA,并且还将遗传到来自卵子捐献者的刚好37个线粒体基因。换句话说,它将从三人中遗传其基因信息。再次,因为同一位捐献者的线粒体基因组会自己找到进入女婴卵子的方法,所以这一过程也将依次改变她的孩子的DNA信息。Three-parent babies and gene-line modifications might be expected to invite shrill headlines about “playing God”. By and large, that has not happened. Britain does not go in for American-style culture wars. But part of the credit also belongs to its cautious bureaucrats. The HFEA has a reputation for thoroughness . This report on safety is the third it has issued. Even then, it recommended a few more experiments be carried out.拥有三个父母的宝宝以及对基因链的修改的报导可能会荣登报纸头条,同时被冠上“扮演了上帝”的尖锐标题。总的来说,这一切是不会发生的,英国并不会陷入美式的文化战争。但是,还有一部分原因是因为有关部门的谨慎行事,人类受精与胚胎素以办事的彻底性闻名。这已经是第三次做出关于其安全性的报告了,即使那样,人类受精与胚胎还是再推荐了几个需要实施的实验。But thoroughness is a good thing with an experimental treatment like mitochondrial transfer, reckons Douglass Turnbull, a neurologist at the University of Newcastle and one of the pioneers of the technique. He points to the HFEAs public consultations. Most people the outfit spoke to “didnt even know what a mitochondrion was, at first,” he says. “But when the technique was explained to them, most decided that the benefits outweighed the risks.” And he points out that many other rich countries, lacking a specialist regulator of their own, look to the HFEAs work to inform their own laws.但是对像线粒体转移这样的实验处理来说,办事彻底并不是一件好事,纽卡斯尔大学的神经病学家同样也是该技术的开创者特恩布尔·道格拉斯这样认为。他指出人类受精与胚胎(HFEA)在公众咨询方面存在的问题,大多是机构人员“起初甚至完全不知道线粒体是什么,”他说道。“但是当有人向其解释了这项技术后,大多数人都认为它的好处超过了它存在的风险,”并且他还指出许多其他富有的国家,因为缺少自己的专业监管机构,正向人类受精与胚胎寻求制定相关法律的帮助。The technique has both public approval and the HFEAs blessing in principle. The government has made it a priority, too: in February it published draft regulations that, if passed by Parliament, would make Britain the first country to license mitochondrial transfer in humans. Assuming no serious problems turn up at the last minute, the first three-parent babies could arrive within a couple of years.这项技术既获得了公众持,原则上也获得了人类受精与胚胎的同意。政府也将其列为优先事项:2月份就公布了相关法律草案,如果一旦被议会通过,这将使得英国成为首个许可人类线粒体转移的国家。假设到最后一刻都没有严重问题出现的话,预计几年后我们就能看到拥有三个父母的宝宝了。 /201406/308405Business商业报道Paying chief executives高管薪酬Fortune favours the boss好运垂青老板Big, controversial golden goodbyes to bosses are probably here to stay老板们巨额而有争议的黄金告别可能会被留下来IS THE new boss of Time Warner Cable about to become one of the luckiest-ever winners of the great chief-executive pay lottery?时代华纳有线电视公司的新老板会成为伟大的首席执行官中最幸运的赢家之一吗?Robert Marcus is set to take over as boss on January 1st.罗伯特·马库斯将于1月1日接任老板。If rumours are to be believed, that will be just in time for the cable firm to be bought by one of a host of rivals that are now circling it.如果传言是可信的,那恰好有线电视公司被环绕的竞争对手中的一位收购。A change-of-control clause in his contract means he could go straight back out of the door with a golden goodbye of over m.合同中的变更条款意味着他可以拥有超过5,600万元的黄金告别走出大门。The biggest loser, in contrast, may be Philippe Varin, who will step down as boss of PSA Peugeot Citron, a struggling French carmaker.相反,最大的输家可能是菲利普·瓦兰,他从一个苦苦挣扎的法国汽车制造商PSA标致雪铁龙老板的位置上下来。On November 27th, he issued a statement saying he would give up a pension provision valued at 21m.11月27日,他发表声明说,他将放弃价值2100万的养老金保障。The board will decide his future pension arrangements before he retires, probably with an eye on public opinion.董事会将在他退休前安排他未来的养老金,可能会顾及舆论的反应。He follows in the footsteps of Fred Goodwin, who presided over the collapse of Royal Bank of Scotland.他步了弗雷德·古德温的后尘,其导致了苏格兰皇家的崩溃。In , again after a public outcry, the man known as Fred the Shred, because of his fondness for firing people, agreed to reduce his pension by 212,500 a year to a paltry 342,500.在年舆论再次哗然,那个喜欢裁人的被称为弗雷德的同意将他的退休金的减少额从212500英镑一年增加到区区342500英镑。It is rare for public disapproval of generous golden goodbyes to have so much impact.公众很少认为这些慷慨的黄金告别有这么大的影响。Even the introduction of say on pay votes in countries such as America and Britain seems only to have curbed the most egregious excesses.甚至在一些引进了薪酬话语权投票的国家如美国和英国似乎只能抑制最令人震惊的过激行为。Ira Kay of Pay Governance, a consultant, says that in America, most company boards facing such votes have managed to win them by dropping overgenerous perks like the automatic vesting of the bosss share options even when he has kept his job following a takeover.薪酬管理顾问艾拉凯指出,在美国,面临着这样投票的公司的董事会已经设法通过清理过于慷慨的激励措施,如老板股票期权的自动归属权,甚至在被收购后还继续他的工作。The once-widesp practice of paying a bosss taxes on his post-takeover payout, a nice little earner known as the excise tax gross-up, has also ended, costing some chief executives millions of dollars, says Mr Kay.凯先生说,在老板的税收上过往的做法是在他退休后出,一个很好的被称为包税的赚钱者也结束了,花掉了首席执行官们数百万美金。Bosses can no longer trigger big severance payouts by self-termination—quitting or retiring—adds Doug Friske of Towers Watson, another pay consultant.另一家薪酬顾问公司韬睿惠悦的道格Friske说,老板们以后不能靠通过自行终止-辞职或退休增加巨额的退休金。Topping up the pension fund for a boss who leaves earlier than expected is now frowned on too.为提前退休的老板补足养老基金现在也行不通了。Say on pay has also forced boards to get better at costing perks that once were wrongly regarded as practically free.薪酬话语权也迫使董事会在之前被认为是随意额外津贴上做的更好。Yet the golden parachute is a chronic problem that I dont see changing anytime soon, says Donald Hambrick, a management professor at Pennsylvania State University.然而,金降落伞是一个老大难问题,我没看到最近会有什么变化,宾夕法尼亚州立大学管理学教授唐纳德·汉姆布瑞克说。The procession of bosses exiting with fabulous pay-offs continues.老板们难以置信的离职金仍在继续进行。Pay consultants brought in by firms seeking a new boss often get blamed for regarding the most generous existing package in the market as the baseline for negotiations.薪酬顾问为企业寻求新的老板常常会因为以市场最多的离职金为基准进行谈判而被责怪。But there is also a small cottage industry of elite lawyers who are used by any candidate to be boss, and who have mastered every trick in the book, Mr Hambrick says.汉姆布瑞克先生说,也有一些曾是老板候选人的小企业中的精英律师,他们懂得书中的所有技巧。By the time the public is frothing at the mouth about some fired corporate failure walking off with a fortune, it is usually too late to do anything about it.这时公众议论的是解雇失败损失的钱,而这通常是来不及做任何事情补救。Everything is negotiated up front; that is the time to be outraged, he advises.他建议一切都协商都进行在前面,这是被激怒的时候。Once a boss has failed and pulled the cord on his golden parachute, boards typically conclude that it is best just to pay up quietly.一旦老板已经失败并且拉着他的黄金降落伞的绳子,董事会一般认为最好是默默的把钱付了。Even though recent legal changes have made it easier, even in America, to claw back some of the money paid to failed bosses, in practice firms will only try to do that if there is cast-iron evidence of fault, such as a financial misstatement.即使在美国,尽管最近的法律变化使得更容易夺回部分付给失败老板的钱,在实践中如果据确凿公司将尝试这样做,如财务失实。None of this should come as a surprise to anyone familiar with the myopic ways boards tend to work in practice.董事会在实践中的目光短浅对所有的人来说这一切都不应该是一件惊讶的事。The moment when a company is paying off a failure is also the moment it is trying to attract the best possible candidate to sort out the mess.当一个公司为失败付钱的那一刻也是它正试图吸引尽可能最好的人选来收拾烂摊子。Contesting the last bosss deal could easily scare off the ideal new one.争辩最后老板的这笔交易很容易吓跑新的理想人选。The CEO wheel of fortune keeps on turning.CEO的命运之轮仍在不断向前。 /201312/270624襄阳宜城市人民中心医院咨询

南漳妇幼保健院中医院处女膜修复多少钱襄阳第四人民医院是公立还是私立Science and technology科学技术3D manufacturing3D制造Print me a phone给我打印一部电话New techniques to embed electronics into products新技术直接把电子元件嵌入产品中OPEN up any electronic device and inside there are circuit boards, components and bundles of wire.拆开任何一个电子设备,你都会在里面发现电路板、电子元件和一束束电线。Assembling these items into a product like a phone can be a tedious, labour-intensive process, and one that is often subcontracted to low-wage countries such as China.把他们组合在一起做成产品的过程是很乏味的,这个劳动密集型的过程常常被分包给低工资的国家,比如中国。Now new ways of printing electronics in three dimensions are being developed.现在三维电子印刷术已经比较成熟,This makes it possible to incorporate circuitry and components into the material the product is made from, such as the phones case.这种新方法使得在原材料上把电路和原件一体化成为可能,It could revolutionise the way electronic goods are made.这将彻底改变电子产品的生产方式。Printing electronics is not new; screen printing, lithography, inkjet and other processes have long been used to manufacture circuit boards and components.印刷电子技术并不新鲜,丝网印刷、光刻、喷墨印刷和其他技术用于生产电路板和元件已有很长时间,But the technologies are improving rapidly and now allow electronics to be printed on a greater variety of surfaces.由于该技术正飞速发展,现在已可以在各式各样的表面进行印刷。In the latest developments, electronics printing is being combined with additive manufacturing, which uses machines popularly known as 3D printers to build solid objects out of material, one layer at a time.在最近进展中,已经把电子印刷和快速成型制造结合在一起,快速成型制造就是使用机器对原材料进行逐层加工成型。Printing electronics requires inks with electrical properties that can act as conductors, resistors or semiconductors.印刷电子技术需要带有电气性能的墨水,这些墨水能扮演导体、电阻或半导体的角色,These inks are becoming more versatile.并且变得越来多才多艺,One example comes from Xerox, an American firm which makes office equipment and commercial printing systems. Its research centre in Canada has developed a silver ink which can be used to print flexible electronic circuits directly onto materials like plastic or fabrics.就拿施乐公司的例子来说,它开发的一种银质墨水能够直接在柔性材料上打印出电路,比如塑料和纤维织物。Silver is a better conductor of electricity than copper, which is typically used in circuits, but silver is expensive and tricky to print because it melts at 962°C.银的导电性要比铜好,所以常用在电路中,但银不仅昂贵而且很难用于印刷。However, by making silver into particles just five nanometres in size, Xerox has produced a silver ink which melts at less than 140°C.然而实验室研究主管Paul Smith说,施乐公司通过把银制成仅有5纳米的小颗粒,生产的银质墨水就能在低于140°C熔化,That allows it to be printed using inkjet and other processes relatively cheaply, says Paul Smith, the director of research at the laboratory.这样的墨水能够通过喷墨方式或者其他比较廉价的处理方式进行打印。Only minuscule quantities of silver are used and there is no waste, unlike chemical-etching processes.与化学蚀刻处理法不同,这种方法不仅银用量极少,并且不会浪费。Xeroxs PARC research centre in Palo Alto, California, is developing ways to use such inks.施乐公司位于加州帕洛阿尔托的PARC研究中心正在研发使用此墨水的技术。These can print circuits for various components, including flexible display screens, sensors and antennae for radio-frequency security tags.这些技术能够为不同的电子元件打印电路,包括柔性显示器、传感器和经安全认的射频天线。With the emergence of additive-manufacturing techniques, it starts to become possible to print such things directly onto the product itself, says Janos Veres, the manager of PARCs printed-electronics team.PARC的电子印刷技术小组主管Janos Veres说,随着快速成型制造技术的出现,直接在产品身上印刷出电路开始变得可能。That includes products with complex shapes.这还包括具有复杂形状的产品,Optomec, based in Albuquerque, New Mexico, has developed additive-manufacturing systems for a variety of industries.总部位于新墨西哥州阿尔伯克基的Optomec公司已经为多个行业开发了快速成型制造系统:It can print electronics directly onto a pair of glasses, for augmented reality; it can make a plastic water tank that uses embedded electronics to measure how full it is and turn pumps on or off; it can print sensors on military armour; or an antenna on the case of a mobile phone.为了增强现实,它能直接在眼镜上进行电子印刷;它能运用嵌入电子技术测量塑料水箱里的水有多满,并控制水泵的开关;能在军用盔甲上印刷传感器;或在手机外壳上直接印刷天线。In a recent three-way tie-up, Optomec worked with Aurora Flight Sciences, an American producer of unmanned aerial vehicles, and Stratasys, a 3D-printing company based in Minneapolis, to make a smart wing for a small drone.在最近三方合作中,Optomec公司与极光飞行科学公司和Stratasys公司合力为小型无人机打造了智能机翼。The wing was made from a thermoplastic material using a Stratasys 3D printer.该机翼由热塑性材料制造,并由Stratasys的3D打印机成型,Optomec then used a process it calls Aerosol Jet to print circuits, sensors and an antenna on the wing.然后Optomec采用名为气雾喷射的技术在机翼上印刷出电路、传感器和天线。The idea is that such technology would allow lightweight drones that can be customised for specific missions and printed on demand.采用这种技术的方法能够让轻量级无人机根据任务和需求进行定制和印刷。Optomecs Aerosol Jet works very differently from inkjet printing, in which a print head positioned barely a millimetre away deposits a droplet of ink on a flat surface.Optomec公司的气雾喷射技术与喷墨印刷术有很大不同。Aerosol Jet at first atomises nanoparticle-based print materials into microscopic droplets, which are then focused, using a sheath of gas, into a precise jet stream directed by a nozzle.后者打印头仅仅在一毫米远的位置把墨水微粒汇集在打印平面上,而气雾喷射技术会先把打印材料雾化为纳米级别的微小液滴,在气体护层下通过喷嘴进行精确聚集喷射,The nozzle can be held five millimetres or more away from the surface, which allows irregular shapes to be coated.这种喷嘴距离打印面5毫米或者更远,所以可以在不规则外形上进行打印。Both the nozzle and the tray holding the item being printed can be manipulated through different angles to work on three-dimensional structures.不管是喷嘴还是撑被打印物体的托盘都可以在三维结构上通过改变角度进行操作,The system can print electronic features smaller than a hundredth of a millimetre wide from a variety of materials.比起动辄上百毫米的电子产品,该技术可以在多种材料上打印出更小的产品。Instead of assembling an item from many separate components, 3D-printed electronics make it possible to print an entire product in a single machine, says Dave Ramahi, Optomecs chief executive.不必把多个单独的组件装配到一起,3D电子印刷术使得用单一机器打印出整个产品成为可能,Optomec 首席执行官 Dave Ramahi说到。However, for the technology to take off he believes it needs to be commercialised in an evolutionary way.然而他认为该技术的使用还需要经历商业化的发展,也就是说在目前大批量生产的过程中只在特定阶段采用该技术,This means applying it at certain stages of existing mass-production processes, such as printing antennae onto mobile-phone cases. Many phones use a number of different antennae to connect to different radio networks, so this would make more room for conventional electronics inside.比如在手机制造过程中印刷天线,因为很多手机采用不同的天线来接入不同的无线网络,这在传统电子产品内部会占用较大的空间。Some commercial applications of the technology are less than a year away, adds Mr Ramahi.他又补充说到,该技术的商业应用会在一年内实现。So how difficult would it be to print a phone complete with all its electronic gubbins?打印一部电话到底有多困难?Optomec is developing applications which could provide some of the necessary steps.Optomec正开发一些应用程序,它们可以提供一些必要的步骤。Besides antennae these include edge circuits for the screen, three-dimensional connections for chips, multiple-layer circuits and touch-screen parts.除了天线之外,它们还可以打印屏幕的边缘电路和联通芯片、多层电路板、触摸屏的三维连接器,It would also be possible to print the battery.甚至电池也可以被打印。The biggest challenge would be to print the chips that are the brains of the phone.但是最大的挑战来自于芯片的打印,These contain millions of transistors in a square millimetre and are at present made in silicon-fabrication plants costing billion or more.这里每平方毫米包含上百万个晶体管,并且目前可制造它的硅加设备价值100亿美元甚至更多,Yet embedding even some circuitry means phones could be made slimmer, as well as reducing the costs of materials and assembly.而植入电路意味着手机可以做的更加纤薄,同时也减少了原材料和装配的成本。 /201402/276294June. Nineteen sixty-nine. Not one airliner but two, plus the pilot of an Air National Guard fighter plane, report being harassed by a team of UFOs. 1969年6月,有两架飞机和空中国民警卫队战斗机的飞行员,报告受到一组不明飞行物的干扰。One man estimates the glowing ships have come within a few hundred feet. 一个目击者估测那些发光的飞船已经来到了距离他们数百英尺以内。The pilot of the fighter plane even declares a near-collision. 战斗机的飞行员甚至还称跟它有近距离碰触。What were these UFOs really?这些真的是不明飞行物吗?It turned out they were fragments of a meteor coming apart in the upper atmosphere. 事实明,它们是流星在高层大气瓦解后的碎片。Now heres the most interesting part: the meteor fragments were at least one hundred and twenty five miles from the planes. 有趣的是:这些流星碎片距离飞机至少有125英里。How could you possibly think something over a hundred miles away was about to hit you? 你怎么会想到一百英里之外的东西会砸得到你?Objects in the sky confuse our perceptual abilities. 天空中的物体会混淆我们的感知能力。With no visual cues to help calculate distance, our brains rely on size and speed instead. How? 没有参照物来判断距离,于是人类大脑依靠尺寸和运动速度来判断物体的大小。怎么判断呢?By using a simple fact: far-away things look like they are going slower than close-up things. 通过一个很简单的道理:远处的东西运动起来看起比近处的东西慢。You may have noticed this when driving: those distant phone poles pass sluggishly while the ones on the road go zooming by. 你或许会在开车时有这种感觉:远处的电线杆移动的很慢,而路边的电线杆则移动的很快。In a blank white sky, our brains default to a simple strategy: the bigger it looks and the faster it goes, the closer it probably is. 在空旷的白天,我们的大脑默认了一个简单的道理:看起来越大、运动的越快的东西,距离我们就越近。This is a smart way to proceed, and it generally works. 这倒是个很聪明的方法,而且通常都能起到作用。Still, our perception can be fouled by rare situations in which we find ourselves looking at something far away that nevertheless moves extremely fast, such as an incoming meteor. 然而当我们在观察那些离我们很远却移动很快的事物的时候,例如转瞬即逝的流星。我们的感知可能会被混淆。At thousands of miles an hour, that flaming object speeds across your field of vision, and your brain can easily conclude it must be much closer than it is--maybe even about to abduct you. 发光的流星以一小时数千公里的速度穿过你的视野,你的大脑很容易觉得它离你比实际距离要近得多。或许它是来绑架你的!201308/252253南漳人民医院肛肠医院好不好襄樊市中医院割包皮收费标准

分页 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29

返回
顶部