蓄水箱隔热
The cistern empties in five minutes. 贮水池五分钟就流乾。
The water slowly emptied (from the cistern). 水(从贮水池)缓缓流出。
The cistern is empty but will soon fill again . 水缸空了，但很快又会满的。
The cistern doesn't clean easily. 这水槽不容易洗干净。
The cistern is empty but will soon fill again. 贮水器里现在没水，但一会儿就会储满水了。
