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 |
| 随便看 |
英语词典包含66266条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。