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.
在肺部，布满粘液的支气管像树一样又分为成千上万个更小的管(细支气管)，他们连接到叫做肺泡的小囊。
Within the lungs, the mucus-lined bronchi split like the branches of a tree into tens of thousands of ever smaller tubes (bronchioles), which connect to tiny sacs called alveoli.
和动物花粉转运系统一样，植物的花囊也发生了惊人的改变，有的从管状和槽状变形为瓣膜状、刷状和刺状。
Flower receptacles, like the animals' transport systems, are wonderfully varied, from tubes and gullets to flaps, brushes, and spurs.
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