Pump impeller loose, grinding to pump out the bottom end caps.

水泵叶轮松动，磨到水泵出水底端盖。

youdao

Watch it-the bottom stair is loose!

当心—最下面一级楼梯松了！

youdao

Watch it-the bottom stair is loose!

当心—最下面一级楼梯松了！

youdao