基本解释[医药科学]胎盘嵌顿英汉例句双语例句Objective To study the effect of umbilical vein infusion of oxytocin on prevention of placental incarceration at os uteri externum.目的探讨经脐静脉推注催产素是否可防止胎盘嵌顿于子宫颈口。专业释义医药科学胎盘嵌顿