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。
It pumps water out of tiny bag-like bladders, making a vacuum inside.
这台机器将空气排出气槽并形成真空状态。
This machine forces air out of the tank and creates a vacuum.
娃娃腔内形成真空，提供了非常强大的吸力。
A vacuum is formed inside the DOLL's entries which provides a very powerful suction.
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