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For the past five million years,
在過去的500萬年中
Arizona's Colorado River has eaten away at the desert sandstone to create a gigantic canyon.
亞利桑那州的科羅拉多河沖走了大量沙石，形成一個(gè)巨大深邃的峽谷
It's over a mile deep and at its widest, it's 1 7 miles across.
它的深度超過1英里，最寬的地方達(dá)17英里
The Grand Canyon. This river has cut the world's longest canyon system,
這就是大峽谷。這條河沖蝕出了世界上最長的峽谷系
a 1 ,000 mile scar clearly visible from space.
在太空中也能清楚地看到這條長達(dá)1000英里的溝壑
As rivers leave the mountains behind, they gradually warm and begin to support more life.
河流離開山區(qū)之后，河水漸漸變暖，養(yǎng)育的動(dòng)物也多了起來。
Indian rivers are home to the world's most social otter.
印度河里住著世界上最具社會(huì)性的水獺
Smooth-coated otters form family groups up to 1 7 strong.
印度水獺的一個(gè)家族可多達(dá)17名成員
Group rubbing not only refreshes their coats, but strengthens social bonds.
集體“按摩”不僅能清潔它們的皮毛，也能增強(qiáng)群體內(nèi)部團(tuán)結(jié)
When it comes to fishing, there is real strength in numbers.
當(dāng)它們?nèi)ゲ遏~時(shí)，群體合作能保證它們屢戰(zhàn)屢勝。
