overlying bed

• 覆盖层

overlying bed的用法和样例：

例句

1. A thick, overlying layer of seafloor rock and sediment would also serve as an additional natural seal to prevent escape.
   由海底岩石和沉淀物组成的稠密覆盖层同样会作为一道额外的天然封条防止泄漏。