any of the air-filled spaces in the body of a bird connected with the air passages of the lungs
a thin-walled expanded portion of an insect's trachea
| 单词 | air sac |
| 释义 | air sacnounany of the air-filled spaces in the body of a bird connected with the air passages of the lungs a thin-walled expanded portion of an insect's trachea |
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