The alveolar ducts surrounded by many smaller and collapsed pulmonary alveolus.
许多肺泡常呈现萎陷的小囊，分布在肺泡管周围；
Alveoli form clusters (alveolar sacs) connected by alveolar ducts to the Bronchioles.
肺泡形成丛集的肺泡囊，经由肺泡管连接至支气管。
The alveoli collapse, and a "glassy" (hyaline) membrane develops in the alveolar ducts.
肺泡萎陷，同时肺泡管中出现“玻璃样”透明质膜。
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