人感染时，机体的白细球吞噬细胞行动起来消除感染。
When we get an infection, white blood cells called phagocytes leap into action.
胸腺吞噬细胞含量甚少。
淋巴和单核吞噬细胞系统是机体的第二道防线。
Lymphatic and mononuclear phagocyte system is the body of the second line of defense.
淋巴和单核吞噬细胞系统是机体的第二道防线。
Lymphatic and mononuclear phagocyte system is the body of the second line of defense.
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