The peritoneal cavity is a closed sac . 腹膜腔是一個(gè)封閉的囊腔。
The testis sacs communicate with the seminal vesicles . 精巢囊與儲(chǔ)精囊相連。
It consists of a stack of flat, membrane-bounded sacs . 它由一大堆扁平的膜緣清楚的囊組成。
Amniocentesis is the removal of fluid from the amniotic sac . 羊膜穿刺術(shù)是從羊膜囊抽取羊水的技術(shù)。
The heart sounds are muffled when the pericardial sac is distended with fluid . 當(dāng)心包充滿(mǎn)液體時(shí)心音減弱。
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為胚胎所利用。
In the first method, one drop of this dilution is dropped into the conjunctival sac . 第一種方法是將一滴這種稀釋液滴入結(jié)膜囊。
The gonads form from a group of large granulated yolk sac cells which invacle the germinal ridges . 性腺是由一群大的顆粒的卵黃囊細(xì)胞入綴生殖峭而形成。
The bombardier's secretion is produced in a pair of glands-large sacs placed side by side in the beetle's abdomen . 噴霧甲蟲(chóng)的分泌液是在一對(duì)腺體--甲蟲(chóng)腹內(nèi)并列的一對(duì)大液囊--里形成的。
Never leave the cul - de - sac . never leave the cul - de - - 決不離開(kāi)死巷決不離開(kāi)死. .