正常情况下，血液为胎盘的增长提供更多的氧和营养。

Normally, the blood supply to the placenta increases to provide more oxygen and nutrients.

youdao

正常情况下，血液为胎盘的增长提供更多的氧和营养。

Normally, the blood supply to the placenta increases to provide more oxygen and nutrients.

youdao