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. 肺包含数百万个小肺泡。
返回 sac
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
（动植物的）囊，液囊
sac noun [C] (SWOLLEN AREA)
medical specializeda type of abscess (= swollen area containing a thick yellow liquid ) under the skin
脓肿
sac noun [C] (TUMOUR)
medical specializeda covering that surrounds a tumour
（肿瘤的）囊膜 返回 sac