A bed of rock is a layer of rock that is found within a larger area of rock. (岩) 层
adjective [原级] [地质]层状的
Between the white limestone and the greyish pink limestone is a thin bed of clay. 在白色石灰石与略带浅灰色的粉红色石灰石之间的是薄薄的黏土层。
verb [vt. 及物动词] 为……提供住宿处；上床；固定在……上；分层（bed 的过去分词）
I bedded the traveller for a night. 我为这位旅客提供一夜住宿。
