first trimester

同根派生

Some women experience morning sickness during the first trimester of pregnancy.
有些妇女在怀孕的头三个月里,早上有恶心感。
The first trimester of pregnancy.
妊娠的头三个月
This is a 33-year-old, primigraida, with a normal first trimester screening.
患者，33岁，初产妇，早期妊娠时检查未看到异常。
First trimester ultrasound: a practical approach.In: McGahan J, Porto M, eds.Diagnostic obstetrical ultrasound.
早期妊娠通过左卵巢的经阴道超声冠状切面，显示黄体囊肿4.;5cm(光标示)。
No data have been published on first trimester teratogenic risk with ondansetron.
没有研究表明在妊娠早期使用恩丹西酮有致畸风险。