nodi lymphatici pararectales

例句：

1. 1. The doctor performeda biopsy on the patient's lymph nodes to investigate the cause ofhis illness.
   医生对患者的淋巴结进行了活检，以调查他疾病的起因。
2. 2. Lymph nodes are important for filtering outforeign substances from the bloodstream.
   淋巴结对于过滤血液中的外来物质非常重要。
3. 3. Thepatient was diagnosed with cancer and underwent surgeryto remove the lymph nodes.
   患者被诊断出患有癌症，并接受了手术来切除淋巴结。