“蓄水池”的英语可以翻译为：[化] impounding reservoir，[医] impounding water reservoir ...

蓄水池的水渐渐流空了.The tank gradually emptied.蓄水池里现在没水,但不久就会储满水的.The cistern is empty but soon fills again.他们正在刷洗蓄水池.They are clearing out the tank....