柯林斯詞典alveolus /?l?v??l?s/ 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劍橋詞典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