| 单词 | air sac |
| 释义 | air sac noun countable specialized ■a space filled with air which continues from a bird's lungs into one of its bones or another body area, used in breathing 气囊（鸟类体内从肺部延伸至骨骼或其他身体部分的气囊，用於呼吸） ■a wide part like a bag in the tubes an insect uses for breathing （昆虫的）气囊 ■an alveolus (= very small air bag in the lungs) 肺泡 |
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