英语语法分析

Without syncytin, mice developed deformed placentas, and their embryos died.

没有合胞体蛋白，老鼠的胎盘畸形生长，胚胎死亡。

Objective: To investigate the effect of passive cigarette smoking on the placentas rats.

目的：检查被动吸烟对孕鼠胎盘的影响。

They compared gene activity in the placentas of healthy pregnant women to those of women with preeclampsia.

他们将健康孕妇胎盘的基因活动与患有子痫前症孕妇胎盘的基因活动进行比对。