vein

The nurse searched for a visible vein in the patient's arm to draw blood.

(Chinese) 护士在病人的手臂上寻找一条可见的静脉来抽血。

Unlike arteries, veins have valves to prevent the backward flow of blood.

(Chinese) 与动脉不同，静脉有瓣膜以防止血液倒流。

Prospectors discovered a rich vein of gold deep within the mountain.

(Chinese) 勘探者在山体深处发现了一条富金矿脉。

The mining company traced the silver vein for several kilometers underground.

(Chinese) 采矿公司在地下追踪了这条银矿脉数公里。