submental vein

例句：

1. 1. The submental vein is a small vein that runs from the lower part of the neck to the upper chest.
   副中线静脉是一条从颈部下部到上胸部的小静脉。
2. 2. During surgery, the surgeon needs to identify and ligate the submental vein to prevent bleeding.
   在手术过程中，外科医生需要识别并结扎副中线静脉以防止出血。
3. 3. The submental vein is often used as an alternative site for blood transfusion during emergency situations.
   副中线静脉常被用作紧急情况下输血的替代部位。