- The annual arrival of spawning salmon
鲑鱼每年都会到河里产卵 - brings huge quantities of food into these high rivers that normally struggle to support much life.
于是这些平常只能勉强维持众多动物生计的 高山河流终于有了提供饕餮大餐的机会 - Although relatively lifeless, the power of the upland rivers to shape the landscape
尽管高山河流的生物量相对较少 它们却有能力改变地形 - 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
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
阅读次数 1
