| 单词 | air sac |
| 释义 | air sac in British Englishnoun 1. any of the membranous air-filled extensions of the lungs of birds, which increase the efficiency of gaseous exchange in the lungs 2. any of the thin-walled extensions of the tracheae of insects having a similar function air sac in American English any of the air-filled cavities in a bird's body, having connections to the lungs Word lists with insect |
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