mid trimester of pregnancy

例句：

1. 1.During the mid trimester, women often experience nausea and fatigue.
   在怀孕中期，妇女经常感到恶心和疲劳。
2. 2.The mid trimester is a critical period for fetal development.
   怀孕中期是胎儿发育的关键时期。
3. 3.Mid trimester ultrasounds are often used to monitor fetal growth and development.
   中孕期超声波检查通常用于监测胎儿的生长和发育。