The bed of the river has been polluted.

这条河的河床受到了污染。

youdao

Several of the missing COINS were recovered from the bed of the river.

丢失的钱币中，有几枚在河床上找到了。

youdao

In the bed of the river there were pebbles and boulders, dry and white in the sun, and the water was clear and swiftly moving and blue in the channels;

河床里，布满了鹅卵石和大圆石，在阳光的照耀下显得干燥而灰白，清凌凌河水在蓝色的河道里湍急地流淌；

youdao

These few survivors, she explains, follow the fish in the dry season to deep pools in the bed of the river near Kratie, in Cambodia.

ECONOMIST: The Mekong river

Divers, working in the pitch black in deep and torrid water, were able to find the car on the river bed and the bodies of four men were recovered.

BBC: Inquiry into four river deaths

It will examine the potential effect of putting a turbine on the river bed at a depth of 20m (66ft) to generate electricity.

BBC: Research into River Dart's tidal power potential