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单词 air sac
释义 air sacn.(名词)
    1. An air-filled space in the body of a bird that forms a connection between the lungs and bone cavities and aids in breathing and temperature regulation.气囊:鸟体内连结肺和骨穴的气囊,帮助呼吸和温度调节
    1. See alveolus 参见 alveolus
    1. A saclike, thin-walled enlargement in the trachea of an insect.气囊:昆虫气管中囊状薄壁的扩张
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