常見例句雙語例句Objective To study the effect of umbilical vein infusion of oxytocin on prevention of placental incarceration at os uteri externum.目的探討經(jīng)臍靜脈推注催產(chǎn)素是否可防止胎盤嵌頓于子宮頸口。 返回 placental incarceration