It was a small vacuum chamber, about the size and shape of a bathtub stopper, that contained a plunger and spring, and had two small air hoses attached to it.
它是一款非常小巧的真空管，形状和大小如浴缸塞，内含一个柱塞和弹簧，由两个小型空气软管连接。
I pull out the stopper in the bathtub...
我把浴缸的塞子拔起来。
If you want to fill a sink or bathtub with water, you need to do one thing first and that's stopper or plug up the drainpipe.
如果你想要给一个水池或浴缸加满水，你首先要做的一件事就是给排水管加上塞子。
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