The water had raced down the slope and scoured out the bed of a stream.

水顺着山坡流下来，冲刷出一条小河道。

《牛津词典》

In particularly wet years, short stretches of an otherwise dry stream-bed may have flowing water because the water table rises to intersect the land surface.

在气候特别湿润的年月里，平常干涸的河床下游可能会有水流动，因为地下水在那里位抬升到了地表以上。

youdao

The prospector panned off bits of sand and gravel scooped from the bed of a stream.

探矿者淘选从河床中挖出的少量含金泥砂和沙砾。

youdao

In the centre of Tafraoute, sheep make their way up a dry stream bed.

BBC: In search of a lost Moroccan oasis

He had slipped the pack off and lowered it gently down between two boulders by the stream bed.

NPR: Robert Jordan, Hemingway's Bipartisan Hero

There was no trail that the young man could see, but they were working up and around the face of the mountain and now they crossed a small stream and the old man went steadily on ahead up the edge of the rocky stream bed.

NPR: Robert Jordan, Hemingway's Bipartisan Hero