clean ballast tank operation manual

例句：

1. 1. Please clean up after yourselves.
   请在你自己的事情做完后清理一下。
2. 2. The room needs to be cleaned before we move in.
   在我们搬进来之前，这个房间需要打扫一下。
3. 3. She cleaned the dishes and put them away neatly.
   她把盘子洗干净并整齐地放好。