- is greater than any other stage in a river's life.
在河流扮演的角色中 这才是最主要的 - Driven by gravity, they're the most erosive forces on the planet.
它们借助地心引力 成为地球上最大的侵蚀力量 - For the past 5 million years
在过去的500万年中 - Arizona's Colorado river has eaten away at the desert's sandstone
亚利桑那州的科罗拉多河 冲走了大量沙石 - to create a gigantic canyon.
形成一个巨大深邃的峡谷 - It's over a mile deep
它的深度超过1英里 - and at its widest it's 17 miles across.
最宽的地方达17英里
Arizona's Colorado river has eaten away at the desert's sandstone 亚利桑那州的科罗拉多河 冲走了大量沙石
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