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A stream flowed gently down into the valley.

一条小溪缓缓地流进山谷。

《柯林斯英汉双解大词典》

Bacteria housed on a graphite fiber anode break down the fats, proteins and sugars in sewage, freeing up a steady stream of electrons, which the bacteria transfer directly into the electrode.

细菌被安置在石墨纤维制成的阳极上，分解污水中的脂肪、蛋白质和糖类，此过程中产生的稳定的电子流将被直接输入电极。

youdao

It's like you've fallen into a stream wearing your down jacket and suddenly it's gone.

NPR: California Oil Spill Could Affect Migrating Birds