drained discharged cell

例句：

1. 1.After the rain, the river was drained of its water.
   雨后，河流里的水都排干了。
2. 2. The old man had drained his last drop of coffee.
   老人已经喝光了他最后一滴咖啡。
3. 3.The reservoir was drained for repairs.
   水库被排空进行维修。