air sac
柯林斯詞典
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(niǎo)類的)氣囊
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air sac
劍橋詞典
- a space filled with air that continues from a bird's lungs into one of its bones or another body area , used in breathing
氣囊（鳥(niǎo)類體內(nèi)從肺部延伸至骨骼以及其他身體部分的氣囊，用于呼吸）
a wide part like a bag in the tubes an insect uses for breathing
（昆蟲(chóng)的）氣囊
an alveolus (= a very small air bag in the lungs )
肺泡 返回 air sac