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