许多肺泡常呈现萎陷的小囊，分布在肺泡管周围；
The alveolar ducts surrounded by many smaller and collapsed pulmonary alveolus.
它可形成负责分泌的小囊，例如会释出神经递质的突触小囊。
It forms vesicle that functions in secretion. eg. synaptic vesicle releases neurotransmitter.
多囊卵巢综合征患者的卵巢有很多小囊泡发育，故称‘多’囊。
In patients with PCOS, multiple small cysts develop in the ovaries, hence the term "poly" cystic.
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