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福州输精管复通术去那比较好中国中文福州空军医院人工受孕好不好

来源:平安面诊    发布时间:2019年08月21日 05:40:30    编辑:admin         

栏目简介:《趣味科普英语视频》有着浓厚的趣味性,能够增加英语学习爱好者对英语科普知识的兴趣,从而更加开心快乐地学习英语知识,建立起英语学习的基础,为以后学习更多的英语知识奠基,快来边看视频边涨姿势吧!201605/441577。

October 29th, 1942.Temperatures heading for minus 50.1942年十月二十九日 气温将近零下五十华氏度But today, the two ends of the road meet.但是今天 道路的两头接合了Corporal Refines Sims becomes a national hero.瑞凡斯·西姆斯下士成为了民族英雄It was a shining symbol of the fact these men are equal to the task,这是一个光辉的象征 象征着不同人种肩负着同等的任务they are equal to their white counterparts,theyre equal men.他们与白人工兵是平等的 他们是平等的人 Within six years, the U.S. Army is racially integrated.六年间 美国陆军集合了不同的人种The Alcan Highway: complete.爱尔肯公路竣工了Part of a 16,000-mile road,它是一万六千英里的公路的一部分The worlds longest drivable route,是世界上最长的可驾驶路线Running the length of the Americas.相当于美洲的长度It was a huge step forward and it led to such demand for more roads这是一个巨大的进步 它给人们带来了对于道路的更大需求that we see roads now literally circling the planet.以至于我们现在看到道路确确实实地环绕着地球Within half a century,The world is wrapped in a network of roads,五十年来 世界包裹在道路网络中Long enough to stretch to the moon and back 20 times.距离长到从地球到月球往返距离的二十倍But while warfare on a global scale Pushes us to connect the world and re-shape it,尽管全球范围的战争 促使我们连接世界 重塑世界It also unleashes a new and terrifying source of power它同时也释放出一种可怕的新生力量之源That could support human life on earth For millions of years,Or obliterate it.它既可以作为人类在地球上生活 几百万年的保障 亦可彻底毁灭人类201605/445917。

TED演讲集 那些匪夷所思的新奇思想201612/480365。

Let’s say you wanted to make yourself a white, sandy beach.如果你想要白色的沙滩。You know, like the ones in Hawaii or islands in the South Pacific where people take luxurious vacations and lots of Instagram photos.就像是夏威夷或南太平洋小岛那样的沙滩,大家尽情享受奢华的假期、拍照发Ins。It turns out, the recipe for that picturesque white sand is pretty simple. There are a couple steps involved, but just one main ingredient: poop.事实上,那种独特的白色沙滩的配方非常简单。只需几步,但是其中最主要的配方是——便便。The first thing you’ll need is a coral reef — it’s location-specific and unfortunately there’s no store-bought alternative.首先,你需要的是珊瑚礁——对珊瑚礁进行定位,糟糕,在商店里可买不到珊瑚礁。Coral reefs are made up of thousands of tiny polyps, which are squishy sacs with tentacles that can sting and catch prey. Kind of like sea anemones.珊瑚礁是由微小的珊瑚虫组成,珊瑚虫是一群带息肉的黏糊糊的囊,它们的触脚可以钉刺并抓住捕食。有点像海葵。These polyps are anchored to a sturdy skeleton that they make by laying down a crystallized form of calcium carbonate called aragonite, which is a bright white color.这些息肉会固定在坚固的骨架上,这些骨架是由被称为霰石的晶状碳酸钙搭成,呈明亮的白色。Reefs are found in parts of the ocean that are considered to be oligotrophic —在部分海洋中发现了被认为营养不良礁石——which means that there aren’t that many tasty nutrients floating around, like phosphate or nitrate. And coral polyps aren’t exactly mobile,这意味着海洋中没有足够的美味营养物,如磷酸盐或硝酸盐。而且珊瑚虫是不可移动的,so if they were left to their own devices, they might starve. But coral polyps aren’t alone.因此,如果它们离开了它们的巢穴,可能会被饿死。但是珊瑚虫也不是没有战友。They get help from an algae called zooxanthellae that live symbiotically in their tissues.它们可以向一种被称为黄藻的藻类求救,黄藻与珊瑚虫共生于它们的组织中。These algae can photosynthesize, changing sunlight, carbon dioxide, and water into food energy,这些藻类可以产生光合作用,能将阳光、二氧化碳及水变成食物能量,and share a large chunk of that energy with the coral. As coral polyps get more energy, they build out their skeletons and grow the reef.并与珊瑚虫共享这些能量。当珊瑚虫获得充足的能量后,它们开始建造自己的骨架并生长出暗礁。And these algae are also what give coral its bright colors.也正是因为这些藻类,珊瑚虫才能拥有明亮的颜色。When you have a thriving coral reef, other undersea plants and animals move in and begin to form a whole ecosystem.当你有了一个茂盛的珊瑚礁后,其他的海底动植物会移居到此珊瑚礁内,整个生态系统开始形成。And to get your white sandy beach, you need some parrotfish, or more specifically... their poop.要想得到白色沙滩,你还需要一些鹦嘴鱼或者更具体地说...你需要它们的便便。Parrotfish get their name for their bright colours and their weird, bird-like beaks.鹦嘴鱼因它们绚丽的颜色和像鸟一样怪异的嘴而得名。These beaks are actually made of fused teeth called dental plates, which help them graze for their main food source: algae.事实上,它们的鸟嘴是由一种被称为牙板的融合牙组成,能帮助它们寻找它们主要的食物来源:藻类。Parrotfish spend their days scraping away at coral reefs, eating polyps for the zooxanthellae inside, and any other algae they can find.鹦嘴鱼整天都围在珊瑚礁附近,想要刮掉并吃掉黄藻里边的息肉,或是吃掉任何它们可以找到的藻类。They’re not super careful or picky, so they end up swallowing mouthfuls of calcium carbonate, too… which they can’t digest for nutrients or energy.它们并不挑食,因此在吃到满满一嘴的碳酸钙后,它们会停止捕食,虽然它们无法消化其中营养和能量。But the parrotfish have a secret weapon — their throats are hiding another set of teeth called pharyngeal jaws that can grind up the coral skeletons.但是鹦嘴鱼有一个秘密武器——在它们的喉咙中隐藏着另一套被称为咽颌的牙齿,能够磨碎珊瑚的骨骼。Like, the xenomorph from Alien… but in real life. This makes it easier for the chunks to travel through their digestive system.就像是《异形》中的异形人来到现实生活一样。这套牙齿使得它们的消化系统能够更加容易的接纳大块食物。And they get rid of this calcium carbonate in streams of the purest, whitest tropical sand.然后它们会将这些碳酸钙排泄到纯净的、最洁白的热带沙流中。In fact, according to some studies, one parrotfish can poop out around 300 kilograms of sand or more in a single year!事实上研究表明,一只鹦嘴鱼一年内能排泄将近300千克的沙子甚至更多!After some ocean currents stir everything around, you have yourself a pristine white sand beach.当一些海流将所有东西搅拌之后,你就可以得到最原始的白色海滩了。Perfect for strolling, sunbathing, and building sandcastles… as long as you don’t mind fish poop.散步、日光浴、堆沙堡...完美,只要你不嫌弃这些鱼便便。Thanks for watching this episode of SciShow, brought to you by our patrons on Patreon.谢谢观看这一期的科学秀,谢谢提问的Patreon观众。If you want to help support this show, you can go to patreon.com/scishow. And don’t forget to go to youtube.com/scishow and subscribe!如果你持这个栏目,请登录patreon.com/scishow。不要记得去youtube.com/scishow订阅我们哟~201707/516457。

Google DeepMind is training its artificial intelligence software to detect early signs of eye diseases.谷歌DeepMind正在训练其人工智能软件来检测眼部疾病的早期症状。Its aimed at detecting two diseases — age-related macular degeneration and diabetic retinopathy. The latter can lead to blindness if not detected early.它的目的是检测两种疾病,即老年性黄斑病变和糖尿病视网膜病变。如果没有及早发现,后者可能导致失明。DeepMind is analyzing about 1 million eye scans to develop an algorithm that can catch early warning signs of the conditions. DeepMind通过分析约一百万份眼部扫描来开发一种算法,能够捕获眼部情况的早期预警信号。If you have an OCT scan done, a machine learning algorithm will be able to tell you if its urgent versus something thats not so urgent.It will allow us to get much earlier detection of the blinding disease.如果你已经完成一次光学相干断层扫描,机器学习算法将能告诉你情况是否紧急,将让我们更早的检测到致盲的疾病。The company has caught flak from privacy critics in the past. It was using patient data to develop an app that identifies the risk of kidney failure. Some said it was allowed too much access to patient information. 谷歌公司过去因隐私问题受到指责。它使用病人的数据开发一个确定肾功能衰竭风险的应用程序。有人称其太多获取病人的信息。But DeepMind says the eye scans were handed over without any identifying information about the patients they came from and are supposed to be completely anonymous. 但DeepMind称眼部扫描不会登记病人信息,患者是完全匿名的。The U.K.s National Health Service and Moorfields Eye Hospital in London partnered with DeepMind to develop the machine learning system. 英国国民健康务和伦敦眼科医院与DeepMind合作开发这项机器学习系统。译文属。201607/453020。

TED演讲集 那些匪夷所思的新奇思想201607/452235。

栏目简介:;Shanghai Live; focuses on big events in the city and major issues around the world, and presents them in a practical and audience-friendly manner to meet the ever-evolving needs of Shanghais English-speaking viewers,both local and expatriate.《直播上海英语电台》集中报道城市大事件以及全球热点话题,并以观众喜闻乐见的方式呈现给大家,从而满足上海本地以及上海海外人士的英语需求。201609/460646。

TED演讲集 那些匪夷所思的新奇思想201609/463936。

TED演讲集 那些匪夷所思的新奇思想201608/457837。