Definition: the ground on the bottom of the sea, a river, etc. Level: C2
沉船残骸位于海床之上。
The shipwreck lies on the ___bed of the ocean.
有时能在干涸的河床中发现化石。
Fossils can sometimes be found in the ___bed of a dried-up river.
潜水员探索了地中海多岩石的海床。
Divers explored the rocky ___bed of the Mediterranean Sea.
