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air sac英英字典_air sac剑桥英语解释_air sac柯林斯英文解释_耀久九英英词典
耀久九英英词典

air sac

A 开头单词

柯林斯词典

    air sac

  • 1. N any of the membranous air-filled extensions of the lungs of birds, which increase the efficiency of gaseous exchange in the lungs (鳥類的)氣囊

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剑桥词典