sac
柯林斯词典
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. 肺包含數百萬個小肺泡。
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sac /sæk/ (sacs)
剑桥词典
sac noun [C] (BAG OF LIQUID)
biology specializeda part of a plant or animal that is like a bag and often contains liquid
（動植物的）囊，液囊
sac noun [C] (SWOLLEN AREA)
medical specializeda type of abscess (= swollen area containing a thick yellow liquid ) under the skin
膿腫
sac noun [C] (TUMOUR)
medical specializeda covering that surrounds a tumour
（腫瘤的）囊膜 返回 sac