n.(动植物组织中的)囊,液囊
abbr.缩写 = (US) Strategic Air Command 战略空军司令部。
The peritoneal cavity is a closed sac.
腹膜腔是一个封闭的囊腔.
Amniocentesis is the removal of fluid from the amniotic sac.
羊膜穿刺术是从羊膜囊抽取羊水的技术.
The heart sounds are muffled when the pericardial sac is distended with fluid.
当心包充满液体时心音减弱.