单词：curve of center of gravity of water plane
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Except for the ruffling of waves, and the pull of the tides, you probably think of the ocean as pretty flat. You wouldn't expect it to have a geography, its waters piled up into lasting hills or sunk into valleys. Sea level ought to be pretty level,
英语时差8，16
纽约援救工作继续进行 Rescue Operations Under Way in New York Jim Malone Newark, New Jersey 12 Sep 2001 03:41 UTC In New York, rescue officials are working through the night to help survivors
VOA2001-国际风云（5）
[00:01.13]Unit 10 Jobs and Chores [00:06.02]Lesson 37 [00:07.80]1.1 a.They have just received a letter. [00:15.03]b.He has just borrowed a book from the library. [00:20.72]c.We have just finished eating all the food. [00:29.13]1.4 Where were you just
北师大版初中英语八年级下
Well, hearing that Odyssey had found subsurface water on Mars was enormously exciting for somebody who is involved in planning to send humans to Mars. Water has a number of important uses for us. At t
火星生命
舞蹈让格莱美更疯狂，欧美金曲能听也能看 爱人的离去犹如空气的抽离，没有你的存在我就身处真空，该如何生存，如何呼吸？ 这一段用No Air作为背景音乐演绎的Hip-Hop极具力度，一张一弛间
格莱美获奖歌曲
A US military refuelling plane has crashed in Kyrgyzstan after exploding in mid air. The aircraft took off from the US military transit center in Kyrgyzstans Manas airport, established for NATO operations in neighbouring Afghanistan. 一架美国军用
CCTV9英语新闻2013年05月
Gravity 重力 What happens if you drop a book? 如果你丢一本书会发生什么？ Absolutely, it will fall down to the floor. This is called gravity. 很显然，书会掉到地上。这就叫做重力。 Gravity pulls from the center of the Ea
与美国小学生一起学英文第6册
Orbit 轨道 Do you know what an orbit is? 你知道什么是轨道吗？ An orbit is the path of a planet when it moves around the sun. 轨道是行星围绕太阳运动的轨迹。 It is similar to a cycling track. 它类似于自行车赛道。 As
与美国小学生一起学英文第12册
VOICE ONE: This is Barbara Klein. VOICE TWO: And this is Steve Ember with THE MAKING OF A NATION, a VOA Special English program about the history of the United States. Today, we tell about the first term in office of President George W. Bush. Mister
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US Marks 14th Anniversary of 9/11 Attacks 美国周五纪念9-11恐怖袭击14周年 The United States is marking the 14th anniversary of the September 11th terrorist attacks. U.S. officials and many other Americans attended observances Friday to rem
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AS IT IS 2016-09-11 15 Years After 9/11 Attacks, Americans Remember 91115年 美国人恐袭阴影犹在 Fifteen years ago, two hijacked passenger airplanes brought down the World Trade Center towers in New York City. Another hijacked plane hit the P
2016年VOA慢速英语(九)月
This is Scientific Americans 60-Second Science. I am Synthia Graber. Got a minute? Wander where and when the next major river flood would had, just look up to the satellites. Conventional estimates a river volumes come from rain fall of course and fr
2014年Scientific American(七)月
Nature reports results from GRACE, a satellite machine designed to use gravity measurement to monitor the world's water resources. GRACE is the Gravity Recovery and Climate Experiment and it's a two-satellite machine. These two satellites are followi
自然百科2010年
Fact: liquid water is heavier than air. Fact: clouds, which consist of water droplets and ice crystals, seem to hover in the air. One final fact: the water droplets in a typical cloud together weigh many tons. Which raises a question: how do clouds s
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地球是太阳系从内到外的第三颗行星，也是太阳系中直径、质量和密度最大的类地行星。它也经常被称作世界。英语的地球Earth一词来自于古英语及日耳曼语。地球已有44～46亿岁，有一颗天然
英语听力文摘 English Digest
去年美国偶像大赛的冠军Jordin Sparks与Chris Brown合作的单曲《No Air》成为美国本周数字下载量增长最快的单曲。 Artist：Jordin Sparks Ft. Chris Brown Song： No Air Tell me how I'm suppose to breathe with no air [oohhhh] [ Jordin S.] If I should die befor
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Sitting on a hill overlooking the crash site near Shanksville, the $26 million visitor center complex was dedicated and opened to the public on Thursday, one day before the annual 9/11 observances in Pennsylvania, New York and Washington. Victims' fa
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Did you ever dream of digging a hole so deep it came out the other side of the earth? Let's play that game again, using a little physics. First we have to imagine that our tunnel is lined with super-heat-resistant material so we can pass through laye
英语时差8，16
Last time we imagined a tunnel through the center of the earth. If such a thing existed, you could step into one end, fall all the way to the other side, and step out. Gravity would cause you to pick up almost exactly as much speed on the way down as
英语时差8，16
THE MAKING OF A NATION - Terrorists Attack America STEVE EMBER: Welcome to THE MAKING OF A NATION American history in VOA Special English. Im Steve Ember. This week in our series, we begin the story of the presidency of George W. Bush. His first term
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