免疫系统中的淋巴细胞能够识别并攻击入侵的病原体。

___Lymphocytes in the immune system can recognize and attack invading pathogens.

医生检查发现她的淋巴细胞数量偏低，建议进一步检查免疫系统。

The doctor found her ___lymphocyte levels were low and suggested further tests for her immune system.