| 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 |