air sacs
英
美
- air n.空气;天空;空中;感觉;神态;曲调;装腔作势v.晾干;使通风;广播
名词 air sac:
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a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
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any of the thin-walled extensions of the tracheae of insects
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any of the membranous air-filled extensions of the lungs of birds