| 单词 | air sac |
| 释义 | air sac [`er ´sak] GEOLOGY See <<vesicle>> INVERTEBRATE ZOOLOGY One of large, thin- walled structures associated with the tracheal system of some insects. VERTEBRATE ZOOLOGY In birds, any of the small vesicles that are connected with the respiratory system and located in bones and muscles to increase buoyancy. |
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