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air sacs的英文翻譯是什么意思，詞典釋義與在線(xiàn)翻譯：
英英釋義
名詞 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
