这是一个正常的一部分，早期妊娠。

It is a normal part of early pregnancy.

youdao

方法： 选择正常妊娠妇女30例，分别在每个妊娠妇女早期、中期和晚期妊娠时采集外周血。

METHODS: Peripheral blood was collected from 30 pregnant women at the first, second, third trimester.

youdao

方法： 选择正常妊娠妇女30例，分别在每个妊娠妇女早期、中期和晚期妊娠时采集外周血。

METHODS: Peripheral blood was collected from 30 pregnant women at the first, second, third trimester.

youdao