large vein

例句：

1. 1. The large vein in the leg is swollen and painful.
   腿部的大静脉肿胀且疼痛。
2. 2. The doctor carefully examined the large veins in her arm.
   医生仔细检查了她手臂上的大静脉。
3. 3. Blood flows through the large veins in the body to deliver oxygen and nutrients to cells.
   血液通过身体中的大静脉流动，将氧气和营养物质输送到细胞中。