| 单词 | air sac |
| 释义 | air sac n. 1. An air-filled space in the body of a bird that forms a connection between the lungs and bone cavities and aids in breathing and temperature regulation. 2. See alveolus. 3. A saclike, thin-walled enlargement in the trachea of an insect. 4. An inflatable pouch attached to the larynx in certain mammals, including the nonhuman great apes. |
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