So, non-Hodgkin lymphoma is a tumor derived from lymphocytes - specifically B-cells and T-cells, which mainly live in the lymph nodes and move through the blood and lymphatic system.

非霍奇金淋巴瘤是一种源于淋巴细胞的肿瘤，特别是B细胞和T细胞，他们主要存在于淋巴结中，并且通过血液和淋巴系统来流动。

The malignant cells then invade surrounding tissues like the salivary glands, muscle, and even get into the blood and lymphatic systems, and metastasize, or travel, to other areas of the body.

随后，这些恶性肿瘤细胞会侵袭邻近组织，如唾液腺、肌肉，甚至还能进入血液和淋巴系统，而后转移到身体的其它部位。

Lymphocytes, on the other hand, mature in the lymph nodes and circulate in both the blood and lymphatic systems. They play an important role in the immune response.

另一方面，淋巴细胞在淋巴结中成熟并在血液和淋巴系统中循环。它们在免疫反应中起重要作用。