Anxious about the terrible fate he could meet at the end of the river stream, he started holding on to rocks and branches.

他担心自己会在溪流尽头遭遇可怕的命运，于是开始抓住岩石和树枝。

In the metaphor of the river stream, they hold on tightly to a branch or rock, afraid to let go, because they want complete control over their position.

在河流溪流的比喻中，他们紧紧抓住树枝或岩石，害怕放手，因为他们想要完全掌控自己的位置。

Vanessa von Biela is a U.S. Geological Survey research biologist who looked at the rivers, streams and lakes where salmon spend early and late periods of their lives.

凡妮莎·冯·比拉是美国地质调查局研究生物学家。他研究了鲑鱼在生命的早期和后期生活的河流、小溪和湖泊。

And all of that water has to find an exit point and it typically finds it by making its way to rivers, streams or creeks.

所有这些水都必须找到出口点，通常是通过流向河流、溪流或小溪的方式找到出口点。