Well, that's the job of the microscopic lymphatic capillaries.

这是显微镜下毛细淋巴管的作用机制。

Unlike the circulatory system, the lymphatic system isn't a closed loop because fluid and proteins make their way into the microscopic lymphatic capillaries, and all of the collected lymph is dumped into the veins.

和循环系统不同，淋巴系统不是一个闭合的环路，因为液体和蛋白质进入微小的毛细淋巴管中，并且所有被收集的淋巴都注入静脉。