first trimester of pregnancy的用法和樣例：
例句
- The women were part of an ongoing maternity cohort who deliered singleton babies and had gien blood samples early in pregnancy.
受試者婦女有部分是正在產(chǎn)科醫院中生了單胞胎并在妊娠早期留有血樣的產(chǎn)婦。 - These results indicate that renin-angiotensin system may exist independently in human placental villi during early pregnancy.
提示人妊娠早期胎盤(pán)絨毛組織可能已存在著(zhù)獨立的腎素一血管緊張素系統。
