- In their upper reaches, mountain streams are full of energy.
上游地段的山涧充满活力 - Streams join to form rivers,
溪流汇聚成河 - building in power,
随着力道的积聚 - 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