vein

医生费了好大劲才在我手臂上找到一根血管来插入针头。

The doctor struggled to find a ___vein in my arm to insert the needle.

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.

在手术过程中，避免刺破任何主要静脉以防止过度出血至关重要。

During the procedure, it's crucial not to puncture any major ___vein to avoid excessive bleeding.