柯林斯词典alveolus /ælˈvɪələs/ 1. N any small pit, cavity, or saclike dilation, such as a honeycomb cell 小窩; 洞; 囊; 如蜂房的巢室 返回 alveolus剑桥词典one of the many very small air bags in the lungs , with thin walls that allow oxygen to enter the blood 肺泡（肺中的細小氣囊，細胞壁薄，有助於氧氣進入血液） 返回 alveolus