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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。...
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The chalazal megaspore of a linear tetrad develops into a polygonum type sac.四分体线行排列,合点端的大孢子发育为蓼型胚囊.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.With embryo sac haustoriumcha...
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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.Starch grains present in the embryo sac and placent...
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sac的复数形式为：sacs...