明星资讯腾讯娱乐2019年08月17日 21:54:07

Professor Julia Lee-Thorp is examining朱莉娅·里霍普教授检测了very ancient teeth from the jaws of both animals and humans生活在数百万年前的动物和人类的which lived millions of years ago.古老牙齿Im incredibly nervous处理古人类牙齿时when Im dealing with ancient human teeth.我紧张得不可思议Its a very awe-inspiring experience, I guess.我想 这是一段激动人心的经历Im very conscious of the fact我很清楚我得that we have to be careful about damaging material,小心翼翼地避免破坏这些化石because its really very precious and rare.因为它们真的非常珍贵而稀有Her experiments are carried out in this tiny laser chamber.她的实验就在这个小激光室中进行Were lining it up to shoot the laser at it,我们将它摆好对齐 向它投射激光and the laser releases激光投射在a very, very small amount of enamel.它们极其微量的釉质上The laser vaporises microscopic holes激光在这些古代牙齿的釉质上in the ancient tooth enamel.打下了一些微孔201504/370814

Today that sounds ridiculous.今日这种说法听来荒唐But two hundred years ago it didnt seem so unlikely.但是两百年前还颇言之成理It was widely believed that当时一般人认为the Earth was only a few thousand years old.地球只有几千年的历史But in the mid-nineteenth century a new science但是19世纪中期was emerging that was painting一股新的科学势力兴起a very different picture of the age of the Earth.并对地球的年龄提出截然不同的见解By looking at the deepest layers of rocks geologists地质学家研究深层岩石后were discovering that the Earth was much older发现地球年龄远超出than anyone had previously imagined.一般人的预期If that was true then the sun also had to如果此言属实have been burning for much,much longer.那么太阳燃烧的时间也应该久得多You can see the strata and the lines in the rock in back of you后方岩石的地层和线条that represent hundreds of代表了millions of years of geological history.好几亿年的地质历史The top of Sacramento Peak up beyond this,我们在更后面的沙加缅度峰上we find fossils that are 300 million years old.找到了有三亿年历史的化石Below Sacramento Peak youve got more than a kilometre沙加缅度峰下方,有一公里多的地层of these strata that are far older than that.年代比三亿年还久远From the age of these strata geologists knew地质学家藉由这些地层得知that the earth was at least a billion years old.地球的历史至少有十亿年At the same time astronomers thought但天文学家却认为the sun was only 10, 000 years old.太阳只有一万年的历史If the geologists were right then astronomers如果地质学家说得对,那么天文学家had to find some other source for the Sun producing its energy.必须另外想办法解释太阳能量的来源The search for the source of energy寻找持了太阳that could power the sun for billions of years数十亿年的能量来源lasted for nearly a century.持续了将近一个世纪Eventually scientists would find the answer in the forces最后科学家终于在凝聚原子的力量that hold atoms together and in the nature of matter itself.和物质的本质中找到But first you have to know what the sun is made of.但首先我们必须先搞清楚太阳的组成To find that out you need to take a very close look at sunlight.想要得到,必须仔细观察阳光When you take the light from the Sun and pass it through a prism,若让阳光穿过棱镜sp it out into the colours,让阳光分色排列as you look through it you notice that it isnt uniform,你会发现阳光的组成并不一致that there are places that are darker.有些地方比较暗Each of those dark lines is due to a specific chemical element.这些暗沉的线条都代表着特定的化学元素Each element has its own series of lines that are specific to it.每一种元素都拥有一系列专属的线条Each chemical element absorbs light at specific frequencies每种化学元素都会吸收特定频率的光线removing a strip from the spectrum.进而移除光谱上的特定区块As the light passes through the sun,光线穿过太阳时all the elements leave their mark.所有的元素都会留下它们的印记So when the light arrives at the Earth it contains所以抵达地球的光线the complete chemical formula of the sun.包含了太阳的完整化学式If we take the spectrum and sp it out to fine details若是把光谱摊开…and what weve done here is stacked up我们在这里pieces of the spectrum one on top of each other把几块光谱上下堆叠you see all of these dark areas.你们可以看到这些暗色区域The key to figuring out how much of these elements至于判定元素含量的关键are there is the bth and the depth of the line;则是这些线条的宽度和深度how dark is the line and how broad is it.也就是它们的深浅和宽窄201503/367263


  With the collapse of Rome,随着罗马帝国的没落Europe reverts to a dark age of war,famine and savagery.欧洲再次陷入到满是战争 饥荒和蛮荒的黑暗时代Many essentials of Roman life are lost for centuries:很多先前罗马生活中的必需品都不复存在The technology to build aqueducts,比如建造水渠的工艺The use of coins,In some areas even writing.硬币的使用 甚至在某些地区 文字也已经消失Rome loses 95% of its population.罗马帝国损失了百分之九十五的人口London is abandoned.The drama of Rome suggests,伦敦俨然成了座废城 罗马的悲剧警示着我们That civilization does not progress in a straight line文明的演化并不是一路平稳Towards more prosperity,朝着更繁荣 更井然有序More order, more law, more technology.法制健全 有更多先进技术的方向发展的It shows us, in the picture,通过图片 我们知道Amazing things being achieved by the Greeks and the Romans,希腊和罗马人曾取得了许多伟大的成就And then those things being lost again.但随着时间流逝 它们又慢慢消逝不见With the fall of Rome,由于罗马帝国的覆灭Europe will fragment and stay divided for 1500 years.欧洲分割的局势持续了一千五百年But two new forces emerge,但随后两股新的势力出现了Key to the story of mankind.他们是人类文明前进的关键From the frozen north: the Vikings.他们是从冰封寒冷的北部而来的维京人From the sun-baked south: the Arabs.以及从烈日炎炎的南部而来的阿拉伯人201511/407936。

  英语非常道 第55期:非诚勿扰2(国际版)在线观看201512/402204

  TED演讲者们对这个世界各抒己见。201506/382096Foreign ministers from the Group of Seven industrialized nations are meeting in the Japanese city of Hiroshima on Sunday and Monday.周日和周一,来自七个工业化国家的外交部长在日本广岛举行会议。Japan is hosting the talks in the city once all but annihilated by a US nuclear bomb to send a message of non-proliferation and peace.会议举办的城市曾遭美国核弹毁灭,释放不扩散和和平信息。It’s also the hometown of Japan’s foreign minister.这也是日本外交大臣的故乡。A traditional Shinto welcome ceremony got Sunday’s schedule underway.传统的神道欢迎仪式拉开了周日的行程。The ministers are expected to talk about extremism following the Brussels Attacks, as well as the refugee issue, nuclear non-proliferation, including North Korea’s recent missile launches, as well as the Middle East and Ukraine.部长们预计将讨论布鲁塞尔袭击极端主义、难民问题、核不扩散,包括朝鲜最近的导弹发射,以及中东和乌克兰问题。Later they plan to visit the Hiroshima Peace Park which commemorates the 140,000 people killed by the first atomic bombing of a human population that was more than 70 years ago.随后他们计划参观广岛和平公园,纪念70多年前在第一颗原子弹爆炸中遇难的140,000人。译文属。 /201604/436573

  Dress rehearsal for Victory Day parade in Russia俄罗斯胜利日阅兵排Russias cutting-edge military hardware has hit the ground in Moscow to rehearse for the upcoming Victory Day celebrations.在即将到来的胜利日庆典排中,俄罗斯的最尖端军事装备亮相莫斯科。Footage of Wednesdays exercises carried on Russian media showed various army vehicles and missile systems, including glimpses of the much anticipated T-14 Armata battle tanks, part of a costly revamping of the Russian military.俄罗斯媒体镜头下,周三排中出现了各式军事车辆及导弹系统,包括备受关注的俄罗斯军事重金打造的改进型新T-14主战坦克。201504/372569Yellow alert for smog issued in many areas in China中国多个地区发布雾霾黄色警报Today Beijing sees its first blue sky in 2016, after several days of continuous hazy weather.在连续几天的雾霾后,北京迎来了2016年的首次蓝天。Meanwhile, some surrounding areas, such as Hebei province, are still struggling with smog.然而与此同时,如河北省的一些周边地区仍然被雾霾笼罩。译文属201601/419881

  Clutch / Accelerator Exercise加速度练习The way we gonna do that.要实现平行转弯滑行。Think of clutch and accelerator, we gonna stand on the top ski,首先想象一下开车时,离合器和油门之间的配合。and thats we do that roll it flat, let the ski come around the first bit of corner by themselves,站在滑雪板上,慢慢翻转雪板,使其自然顺畅地转向第一个弯道。thats what we want to do, and we gonna finish nice and parallel.我们要尽可能顺畅地完成这个动作,并保持滑雪板的平行。There are two things you gonna use to help you achieve that, lets take a look.那具体应该如何实现呢,让我们一起看一下吧。Im going to use my hands down here to show you where the pressure or weight is changing from foot to foot.我将用交替下压的双臂来展示滑行过程中身体压力或重心是如何从一只脚转移到另一只脚的。Think about what you do when you change gear.想象一下开车时,你是如何换挡的。As a lifted accelerator, I would start to push down the clutch, its the same feeling.松开油门,踩下离合器.....就是这种感觉。You can see this close-up: the way is coming off the down-hill ski and onto the top ski, as it rolls onto the new edge.来看一下近景:在滑雪板转换立刃的过程中,雪面脱离;山下板;,贴触;山上板;。Its a combined movement, as I stand on the top ski, I can feel the way coming off the down-hill ski.这是一个交替的过程。当身体重心落在;山上 板;时,你能感受到雪面脱离;山下板;。Okay, so Im on that left leg. Smoothly onto the right, feel the way coming over, now onto the up-hill ski.身体重心当前落在左腿上,平稳地转移到右腿上,请你们体会一下雪面掠过并貼触;山上板;的感觉。Remember, as I start to stand on that right leg, roll it over.记住,当我准备把重心落在右腿上时,我就得翻转滑雪板。But it comes round smooth.如上所述,交替进行,就能平稳顺畅地平行转弯滑行了。If youre finding that hard, its not working for you, you might be not changing the edge, as you changing the weight.如果你感觉上述过程进行得很艰难,动作运行不畅,那是由于你在转换重心和立刃的时候不够协调一致。So feel, as you gonna stand onto that top ski, roll the ski flat and gently over to inside,让我们来原地体会一下,当你要将重心转移到;山上板;时,先将滑雪板翻转平稳,然后逐渐转向内侧,and it would start to come around much smoother.从而实现平稳转弯。Im going across the hill, and now I gonna to start to stand on that top ski.我现在要穿过山丘,然后站在山上板上面。If you keep fit on the outside of the edge, its gonna simply keep going the same way of pointing.如果你在外侧的立刃感觉比较舒,那就继续按照前面所说的相同的方式进行吧。So remember the second you gonna start transfer the way, roll that ski over,第二点需要记住的就是,你要开始转弯,翻转滑板。and it would start to turn for you much easier. Make a nice smooth blend.在你完成重心转移后,要记得及时翻转滑雪板,保转弯滑降顺畅。Its an combination of standing on the up-hill ski and rolling ski over onto the new edge.平行转弯滑行的过程,就是身体重量落在;山上板;,并交替立刃的过程。You can see that as I do this, the ski will naturally start to turn down hill.可见,当我平行转弯时,滑雪板能自然顺畅地沿着山坡蜿蜒而下。You notice that the snow plough has disappeared at the start and skis extend parallel throughout the whole turn.注意啦,从一开始;犁式滑行;就消失了,在整个转弯下坡的过程中,滑雪板始终保持平行。注:本文翻译由en88字幕组完成。201504/369106


  栏目简介:《造物小百科How its made》介绍了许多东西的制作或者说发明方法,非常实用。其中的英语视频发音地道,内容浅显易懂,过程形象生动,是提高英语听力水平,积累英语知识和一些简单生活常识的好素材。201509/392022

  The educational materials presented here were developed此处展示的教育材料由by students and faculty of the department of food爱荷华州立大学食品科学与营养学的师生science and human nutrition at Iowa State University.共同制作Funding for this project was provided from grants from该项目资金由the American Cancer Society Mid West美国癌症协会中西部分会及and the Lance Armstrong Foundation.兰斯,阿姆斯特朗基金会共同资助The materials are intended for educational use and此资料仅旨在教学使用are not meant to provide medical advice.无意提供任何医学建议We welcome your feedback about these materials.我们期待您对这些资料的意见反馈Please use the evaluation survey link on the homepage请使用主页上的教育调查链接to provide your comments and suggestions.发表您的意见和建议Coffee and gastro intestinal cancer risk.咖啡与胃肠癌患病风险Coffee is a brewed drink.咖啡是一种煮制饮品It is prepared from roasted seeds of the coffee plant.由咖啡树的种子烘培而来The plant itself is like a shrub or a small tree.这种植物本身类似一株灌木或一棵小树The coffee beans are inside a red or purple fruit and咖啡豆便在所结的红色或紫色的果实中coffee is often known for its high caffeine content.咖啡通常以高咖啡因含量而出名In general coffee consumption has been found to总体来说饮用咖啡被实provide a weak protective effect在抵抗各种癌症方面against a variety of cancers. Coffee is comprised of可以起到微弱的保护作用,咖啡包含a wide variety of chemical compounds which give it各种各样地化学成分a rage of aromas and tastes that consumers enjoy.令饮用者可以享受多种芳香与美味It is likely that some of these compounds很有可能咖啡对健康的益处就contribute to the health benefits of coffee.归功于这其中的某些成分Coffee contains specific ingredients咖啡中某些特定成分that are unique to the coffee bean.是咖啡豆独有的Diterpenes belong to a large and varied class of双萜化合物便从属于类型繁多的烃类hydro carbons; it has been proposed that combinations通常认为,咖啡中的混合物in coffee such as cafestol and kahweol may如咖啡醇和咖啡豆醇混合物contribute to the anticarcinogenic effect of coffee.使得咖啡具有抗癌的效果Coffee, like tea, also contains polyphenols. Lignins同茶一样,咖啡也包含多元酚and flavonoids are found in coffee and木质素与类黄酮存在于咖啡中both are known to have anticarcinogenic properties.二者均以抗癌的特性而著称Another component of coffee is chlorogenic acid.咖啡中另一种成分为绿原酸Chlorogenic acid may be assisting with moderating绿原酸可以协助减缓餐后the rate of glucose release into the blood stream葡萄糖向血液中释放的速度after a meal and increasing insulin sensitivity.增强胰岛素的敏感性Both of these effects would be beneficial in这些作用都将有益于protecting from diabetes.预防糖尿病Chlorogenic acid also has antioxidant effects绿原酸同样具有抗氧化作用which may also reduce the risk of cancer.这也将降低患癌症的风险In a recent review of the science associated with在最近一项有关饮用咖啡与癌症风险的coffee consumption and cancer risk it was found that科学成果中发现drinking more than 3 cups of coffee a day was每天喝三杯以上的咖啡associated with a slight increase of a specific form会略微增加患某一特定类型的胃癌的风险of gastric cancer but not with other forms of gastric但与其他类型的胃癌无关cancer. Cancer of the pharynx, larynx, and esophagus饮用咖啡were not affected by the consumption of coffee.对咽喉癌和食道癌均无影响201502/358219

  TED演讲集 那些匪夷所思的新奇思想201604/436896

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