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；
Pulmonary alveolus: Any of the 300 million or so small air Spaces in the lungs where carbon dioxide leaves the blood and oxygen enters it.
肺泡：肺内的约3亿个小气囊，于此，二氧化碳从血中排出，氧气进入血液。
Pulmonary alveolus: Any of the 300 million or so small air Spaces in the lungs where carbon dioxide leaves the blood and oxygen enters it.
肺泡：肺内的约3亿个小气囊，于此，二氧化碳从血中排出，氧气进入血液。
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