air sacs

• 肺泡

air sacs的英文翻译是什么意思，词典释义与在线翻译：

英英释义

名词 air sac:

1. a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways

2. any of the thin-walled extensions of the tracheae of insects

3. any of the membranous air-filled extensions of the lungs of birds