Venula

例句：

1. 1. The doctor examined her venous system for signs of infection.
   医生检查了她的静脉系统以寻找感染的迹象。
2. 2.Blood vessels are essential for the exchange of oxygen and nutrients throughout the body.
   血管对于全身的氧气和营养物质交换至关重要。
3. 3. The veins in the arm were swollen from the injury.
   手臂上的静脉因伤而肿胀。