这个词是什么意思？
Small polyhedral outpouchings along the walls of the alveolar sacs, alveolar ducts and terminal bronchioles through the walls of which gas exchange between alveolar air and pulmonary capillary blood takes place.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D011650 · MeSH 2026。
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