柯林斯詞典sac /s?k/ (sacs) 1. N-COUNT A sac is a small part of an animal's body, shaped like a little bag. It contains air, liquid, or some other substance. 囊 The lungs consist of millions of tiny air sacs. 肺包含數(shù)百萬(wàn)個(gè)小肺泡。 返回 sac劍橋詞典 sac noun [C] (BAG OF LIQUID) biology specialized a part of a plant or animal that is like a bag and often contains liquid （動(dòng)植物的）囊，液囊 sac noun [C] (SWOLLEN AREA) medical specialized a type of abscess (= swollen area containing a thick yellow liquid ) under the skin 膿腫 sac noun [C] (TUMOUR) medical specialized a covering that surrounds a tumour （腫瘤的）囊膜 返回 sac