听力文本

For the past five million years,
在过去的500万年中
Arizona's Colorado River has eaten away at the desert sandstone to create a gigantic canyon.
亚利桑那州的科罗拉多河冲走了大量沙石，形成一个巨大深邃的峡谷
It's over a mile deep and at its widest, it's 1 7 miles across.
它的深度超过1英里，最宽的地方达17英里
The Grand Canyon. This river has cut the world's longest canyon system,
这就是大峡谷。这条河冲蚀出了世界上最长的峡谷系
a 1 ,000 mile scar clearly visible from space.
在太空中也能清楚地看到这条长达1000英里的沟壑

As rivers leave the mountains behind, they gradually warm and begin to support more life.
河流离开山区之后，河水渐渐变暖，养育的动物也多了起来。
Indian rivers are home to the world's most social otter.
印度河里住着世界上最具社会性的水獭
Smooth-coated otters form family groups up to 1 7 strong.
印度水獭的一个家族可多达17名成员
Group rubbing not only refreshes their coats, but strengthens social bonds.
集体“按摩”不仅能清洁它们的皮毛，也能增强群体内部团结
When it comes to fishing, there is real strength in numbers.
当它们去捕鱼时，群体合作能保证它们屡战屡胜。

词汇解析

1.eat away 侵蚀
For eons,the pounding waves ate away at the shoreline.
长时期以来波涛汹涌的海浪冲蚀着海岸线。

2.strength in ...的力量
Webster and his supporters were Tyler's only real strength in the Whig Party outside of Virginia.
在维吉尼亚州以外，韦伯斯特和他的支持者是泰勒在辉格党唯一真正的力量。

视频及简介

淡水是我们最宝贵的资源，它决定了地球上生命的分布。同河流一起，从高高的山峰一路而降，直向大海，观看壮观的瀑布，在大峡谷里飞翔，在世界上最深的湖泊的冰雪下面探索野生的生命，见证动物行为的独特的、生动的一面：水獭和泽鳄将一决胜负。