The peritoneal cavity is a closed sac . 腹膜腔是一个封闭的囊腔。
The testis sacs communicate with the seminal vesicles . 精巢囊与储精囊相连。
It consists of a stack of flat, membrane-bounded sacs . 它由一大堆扁平的膜缘清楚的囊组成。
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 placenta are utilized by the embryo . 存在于胚囊和胎座中的淀粉粒为胚胎所利用。
In the first method, one drop of this dilution is dropped into the conjunctival sac . 第一种方法是将一滴这种稀释液滴入结膜囊。
The gonads form from a group of large granulated yolk sac cells which invacle the germinal ridges . 性腺是由一群大的颗粒的卵黄囊细胞入缀生殖峭而形成。
The bombardier's secretion is produced in a pair of glands-large sacs placed side by side in the beetle's abdomen . 喷雾甲虫的分泌液是在一对腺体--甲虫腹内并列的一对大液囊--里形成的。
Never leave the cul - de - sac . never leave the cul - de - - 决不离开死巷决不离开死. .
