hilum of lymph node

例句：

1. 1. The hilum of the lymph node is where the lymph fluid drains from the surrounding tissue.
   淋巴结的淋巴管是淋巴液从周围组织引流的地方。
2. 2. During surgery, the surgeon must identify and ligate the hilum to prevent infection.
   在手术中，外科医生必须识别并结扎淋巴结以防止感染。
3. 3. The hilum of the lymph node plays a crucial role in immune function.
   淋巴结的淋巴管在免疫功能中起着至关重要的作用。