腿部的静脉有时会肿胀。

The ___veins in the leg can sometimes become swollen.

我能感觉到血液在我的血管中搏动。

I could feel the blood pulsing through my ___veins.

护士很难找到一条合适的静脉进行注射。

The nurse had difficulty finding a suitable ___vein for the injection.