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。
2
The water had raced down the slope and scoured out the bedof a stream.
水顺着山坡流下来,冲刷出一条小河道。
《牛津词典》
3
The prospector panned off bits of sand and gravel scooped from the bedof a stream.