All mammals except monotremes and marsupials are placental mammals.

除了单孔类动物和有袋动物之外所有的哺乳动物都是有胎盘的哺乳动物.

Formation of placental villi also starts around 13 days after conception.

同时在受孕13天时胎盘的绒毛也逐渐形成.

Three - dimensional sonography makes the calculation of placental volume easy.

三维超声可以轻松地计算出胎盘的体积.

After about 36 weeks to determine how much amniotic fluid and placental function.

怀孕晚期大约36周以后，以确定羊水多少以及胎盘的功能。

Chorion:The outer membrane enclosing the embryo in reptiles, birds, and mammals . In placental mammals it contributes to the development of the placenta.

绒毛膜：在爬行类动物、鸟类及哺乳类动物中包含胚胎的外膜，在有胎盘哺乳动物中与胎盘的发育有关。

Placental abruption is a serious pregnancy complication.

胎盘早剥是一种严重的妊娠并发症。

Placental abruption can lead to fetal oxygen deprivation.

胎盘早剥可能导致胎儿缺氧。

They took immediate action to treat her placental abruption.

他们立即采取措施治疗她的胎盘早剥。

Symptoms of placental abruption include abdominal pain and bleeding.

胎盘早剥的症状包括腹痛和出血。

The doctor told her she was at risk of placental abruption.

医生告诉她，她有胎盘早剥的风险。