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赣州市仁济不孕不育多少钱飞度专家

2019年08月18日 09:57:04 | 作者:知道网 | 来源:新华社
In some cases, they can only be seen with the latest mapping techniques,like this one in Brazil.有时候需要专家的绘图技术 才能揭示一个陨石坑的存在比如这个位于巴西的But even with this technology,less than 200 impact craters have been found across the entire planet.但即使是用最精密的设备 在整个地球上 找到的陨石坑也不超过200个This is partly because erosion continually rubs out the evidence of past impacts,部分原因是因为腐蚀现象 不断抹去过去冲击的据but its also because of the atmospheres protective role.但是也是因为大气层发挥了保护作用To understand how something as intangible as thin air protects us from meteors,为了理解像空气这样薄稀的事物 如何保护我们不受陨石侵害you need to find a meteorite that has survived its fall to Earth.你需要寻找一个成功掉到地球上来的陨石Meteorites are rare, so you need to go to great lengths to track one down.陨石很稀少所以你需要费很大的劲去寻找Dr Phil Bland is a planetary scientist on just such a mission,菲尔·布兰德就是一个执行该使命的科学家leading an expedition out onto the barren NuHarbor Plain我跟他一起踏上了征程in Western Australia, three days drive from the nearest town.到澳大利亚西部有三天的车程201512/414385栏目简介:《趣味青春英语视频》是外语网络电台的精品节目,通过大讲堂的网络课堂形式,能够帮助英语学习者积累一些英语背景知识,并通过互动的教学形式,帮助有效记忆英语知识。本栏目是学习趣味青春英语的好材料。201604/431303From space you can really see how fluid ice is.从这便能看出,冰层的流动确实存在On the west coast of Greenland,在格陵兰岛的西海岸glaciers flow around the contours of a landscape hidden beneath the ice.冰河在冰层底下沿着陆地的轮廓流动A false colour image reveals the blue ice of the Ma la spina Glacier in Alaska.地图上描绘了阿拉斯加境内马拉斯皮纳冰川的蓝色冰层It flows through a gap in the mountains它跨过了山脉间的深沟and sps out like syrup for more than 30 miles.如浆液般展开,距离超过50公里This is part of the Lambert Glacier in Antarctica.这是南极州内兰伯特冰河的一部分Its one of the longest glaciers on Earth.兰伯特冰河是世界上最长的冰河之一You can follow its flow lines as it bends and twists你可以随着它的流动轨迹弯曲和盘旋on its slow-motion descent.慢慢的向下Ice is soft and bendy,冰层是如此柔软易弯yet its also powerful enough to destroy almost everything in its path.当然,它也有足够的能量来摧毁挡在它路线上的一切But while glaciers usually take tens of thousands of years to sculpt the landscape,但冰河一般要花几万年的时间 来雕塑地貌occasionally, they can trigger a devastating change有时,它们会引起破坏性的变化that happens in just a few hours.在不久之前刚刚发生过You can see the aftermath of one such event你能看到这种事情的后果in the northwest corner of the ed States.在美国的西北角201510/404135TED演讲集 那些匪夷所思的新奇思想201604/436796

See if you can ID me.看你能否鉴别出我。I was developed in the late 1800s by American inventor, Christopher Latham Sholes. 美国发明家克里斯托夫·拉森·肖尔斯在19世纪发明了我。I was eventually named the Remington and occasionally used by author Mark Twain.我最终被称为雷明顿,作家马克·吐温有时会用到我。Im a machine that produces characters like those made by a printing press. 我就像印刷机那样打出字幕。Im a typewriter and the first ones on the market only wrote in capital letters.我是打字机,市场上第一台打字机只能打大写字母。AZUZ: Of course, people wanted to be able to use lower case type, so some of the first typewriters had two keyboards, many with one behind the other. 当然,人们想要使用小写字体,因此最早的打字机有两幅键盘,一幅在另一个的后面。One had capitals and one had lower case.一个有大写字母一个是小写字母。A typewriter with a shift key that needed only one keyboard started being sold around 1878. 只有一个键盘带有转换键的打字机在1878年面市。It eventually became more popular.之后它变得更加流行。But all of these things are just useless antiques now, right?但这些东西现在只是无用的古董吗? /201503/366851

Egypts Russian plane probe chief to hold briefing俄罗斯飞机坠毁事件调查组组长进行情况汇报The chairman of the Egyptian-led probe into the Russian plane crash in Sinai is scheduled to hold a press conference in Cairo today at 3 PM GMT.埃及的这个调查组组长定于今天下午3点在开罗就俄罗斯飞机在西奈半岛坠机事件召开新闻发布会。Hes set to be joined by the civil aviation minister. 他是受民航部长命令进行事故原因调查。译文属201511/408658

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