液囊

• sac

例句

1. （牛的）乳房有机体器官的液囊或袋，如牛的乳房
   An organic sac or pouch, such as the udder of a cow.
2. 池有机体体内一种贮存流体的液囊或穴
   A fluid-containing sac or cavity in the body of an organism.