- creating rapids.
形成激流 - The water here is cold.
这里的水较冷 - Low in nutrients, but high in oxygen.
营养物质不多 但含氧量却很高 - The few creatures that live in the torrent
生活在急流中的少数几种动物 - have to hang on for dear life.
得有办法固定自己以保住性命 - Invertebrates dominate these upper reaches.
无脊椎动物统治着上游河段 - The hellgrammite, its body flattened to reduce drag,
这是鱼蛉 其扁平的身体 能减少水的冲击力