Before leaving, Mr. Seymour turned off the vacuum cleaner and the water valve.
在离开之前，西摩先生关掉了真空吸尘器和水阀。
2
It pumps water out of tiny bag-like bladders, making a vacuum inside.
它把水从像袋子一样的囊状物里抽出来，使囊状物的内部形成真空状态。
3
We know the water moves downwards when its left to itself as in rain, but you see if it moves downward on the right that would leave a gap, vacuum a hole in the pipe.