Lymphocyte function in the cellular immune system features both afferent (receptor) and efferent (effector) components.

细胞免疫系统的传入(受体)和传出(效应器)功能都受到淋巴细胞功能的影响。

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Natural killer (NK) cells are an important component of the innate cellular immune system which provide a first line of defence against viral infections.

自然杀伤（NK）细胞是天然细胞免疫系统的重要组成部分，是防御病毒感染的第一道防线。

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The job is particularly difficult in the case of chlamydiae because these bacteria have special ways of protecting themselves from attack by the cellular branch of the immune system.

这项工作在对抗披衣菌上，更是困难，因为披衣菌拥有特殊的自保之道，可以躲掉免疫系统当中细胞免疫的攻击。

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