1. The peritoneal cavity is a closed sac. 腹膜腔是一个封闭的囊腔。
2. They have a noticeable tail and males have large scrotal sac. 它们的尾巴非常明显，并且雄性有很大的阴囊。
3. OMNEX is the only company authorized to deliver training for the Semiconductor Assembly Council (SAC). OMNEX是唯一的公司授权了交付为半导体训练汇编委员会（囊）。
英英解释
n.
1. an enclosed space
2. a case or sheath especially a pollen sac or moss capsule
3. a member of the Algonquian people formerly living in Wisconsin in the Fox River valley and on the sh
4. a structure resembling a bag in an animal
