1、The first trimester is an important time in your pregnancy, especially in terms of nutrition.
妊娠初期，尤其是在營養(yǎng)方面，對孕婦來說是非常重要的。

2、This is a 33-year-old, primigraida, with a normal first trimester screening
患者，33歲，初產(chǎn)婦，早期妊娠時檢查未看到異常。

3、The first trimester of pregnancy.
妊娠的頭三個月

4、Now that you’ve reached the end of the first trimester it’s fairly safe to spread the news.
既然你已經(jīng)到了懷孕前期的末期，現(xiàn)在公布消息就相當安全了。

5、See your eye doctor within the first trimester of pregnancy.
在懷孕的前三個月要去看眼科醫(yī)生。