Earth and Sky:Water Cycle 水循环

Water Cycle 水循环 All the oceans on earth are salty, while inland water is typically fresh. How does water become salty? We'll answer a listener's question -- today on Earth and Sky. DB: This is Earth and Sky. We recently visited the Austin Childr

Earth and Sky:Aqua Spacecraft 水资源监测太空船

Aqua Spacecraft 水资源监测太空船 NASA's latest and most ambitious weather satellite is measuring Earth's water cycle. Learn more about the Aqua satellite -- today on Earth and Sky. DB: I'm Deborah Byrd. JB: And I'm Joel Block for Earth and Sky. This

Horizon - Life On Mars 火星生命 - 3

Conditions on Mars were so harsh that it was hard to imagine any life surviving there. The idea of sophisticated aliens was wiped out. We know that conditions on Mars today are not very good for life.

礼节美语 Business Etiquette 150 Jet Lag (2)

Mike出差刚回来，被时差折磨得痛苦不堪，向同事Larry咨询缓解时差的好办法。Larry说， Larry: Some people take herbal medicine, but there's really no solid proof that it works. Some people take sleeping pills and try to sle

英语听力：自然百科 旱灾的成因与影响

旱灾的成因与影响 Its signs are subtle and slow: the earth dries; water levels fall; the rains do not come; and the land is gripped by drought. At its most basic, a drought occurs when more water is used than isreplenished. It is a balance bet

英语听力：探索发现 科学新发现：我们的大气层-18

The air thins and they begin to lose the protective weight of the miles of air above them. The pressure is dropping, when you finally get to the stratosphere, and to the altitude we like to work at, it's only one one hundredth that of it's on the gro

科学家称北极的暖冬气温已破纪录

Record Warm Winter in Arctic, Scientists Say New weather information shows the Arctic just had its warmest winter on record. The same information also shows that sea ice hit record lows for this time of year. That means there is plenty of open water

英文短文：Cohesion-tension Theory

Cohesion-tension Theory Atmospheric pressure can support a column of water up to 10 meters high. But plants can move water much higher; the sequoia tree can pump water to its very top more than 100 meters above the ground. Until the end of the ninete

商务礼节美语第35期:飞行时差反应(2)

Mike出差刚回来，被时差折磨得痛苦不堪，向同事Larry咨询缓解时差的好办法。Larry说， Larry: Some people take herbal medicine, but there's really no solid proof that it works. Some people take sleeping pills and try to sle

英语听力：自然百科 神奇水世界 Water-5

What that circulation means to us human is that water is a moving target. We constantly have to seek it out in this endless cycle and intercept it wherever and whenever we can. This quest depend on water has played a defining role in human history. T

英语听力：自然百科 神奇水世界 Water-4

Let's look first. The fresh water that we depend on begins its life in the oceans. As the sun's rays beat down on the surface of the sea, they heat the water molecules until some evaporate. It's the start of an extraordinary journey. Here with water

英语听力：自然百科 神奇水世界 Water-11

It's just magic. When you follow it, you can see that this is the perfect union of the tree and the villages. The locals have kind of trained the roots, kind of guided them through and netted them together. What they've done here is they've grabbed s

英国学生科学读本 第35期:蒸汽往上冒(2)

There would soon be an explosion; the kettle would be burst open. It is in this way that boiler explosions are often caused. When there is too much steam in a boiler, and it cannot get out, it presses against the sides of the boiler, until at last th

NASA to launch ocean-watch satellite in June

WASHINGTON, May 17 (Xinhua) -- The U.S. National Aeronautics and Space Administration (NASA) announced Tuesday that the international Aquarius/SAC-D observatory will be launched on June 9, to study interactions between ocean circulation(循环) , the

商务礼节美语第185期:Jet Lag 倒时差(下)

Mike出差刚回来，被时差折磨得痛苦不堪，向同事Larry咨询缓解时差的好办法。Larry说， Larry: Some people take herbal medicine, but there's really no solid proof that it works. Some people take sleeping pills and try to sle

科学喝水要知道的4件事

【英文原文】 If I were to stop drinking water right now, how long could I live? There are several different factors involved here. A human being isnt an automobile which needs a certain amount of gas. There are conditions under which a person c

VOA标准英语2009年-UN: Drought Forcing New Cycle of Human Suf

By Alisha Ryu Near Galkayo, Somalia 06 October 2009 The United Nations is warning that years of drought and conflict are pushing many regions of Somalia toward a new cycle of hunger, devastation, and human suffering. Worse than ever Rotting carcass

【英语时差8，16】水上运动

In 1993, water aerobics was only for senior citizens or patients in rehab. Nowadays, it encompasses a variety of trendy underwater sports, all of which are healthy. The body has 90 percent support when under water. That means the joints only have to

英语听书《海底两万里》第218期 第16章 在海底平原散步(9)

These algae are a genuine prodigy of creation, one of the wonders of world flora. 这些海藻类实在是造化的奇迹，宇宙植物界的一个奇迹。 This family produces both the biggest and smallest vegetables in the world. 地球上最小和

英语听书《海底两万里》第168期 第12章 一切都用电(1)

These are the normal navigational instruments, I replied, and I'm familiar with their uses. 这些是航海家常用的仪器，我答，我知道它们的用法。我现在看见的这个表盘，上面有能转动的针，那不是流体压力计吗？