vein

例句：

1. 1. The veinsin the skin are responsible for carrying oxygenated blood to the rest of the body.
   皮肤中的静脉负责将富含氧气的血液输送到身体其他部位。
2. 2. The doctorremoved the tumor from the patient'sleg and sent it for testing.
   医生从患者的腿上取出了肿瘤，并送去进行了测试。
3. 3. Theveins in her arm wereswollen and painful.
   她的手臂上的静脉肿胀且疼痛。