venae umbilicalis

例句：

1. 1.The baby's umbilical vein was exposed during the delivery.
   分娩过程中宝宝的脐带静脉暴露了。
2. 2. The surgeon performed a successful umbilical vein ligation.
   外科医生成功地进行了一次脐带静脉结扎术。
3. 3.During the operation, the surgeon carefully dissected the venae umbilicalis to avoid damaging the blood vessels.
   手术中，外科医生小心翼翼地解剖脐带静脉，以避免损伤血管。