回答： 您好：NK细胞是自然杀伤细胞(natural killer cell，NK)是机体重要的免疫细胞，不仅与抗肿瘤、 抗病毒感染和免疫调节有关，而且在某些情况下参与超敏反应和自身免...
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自然杀伤细胞是一类与T细胞和B细胞不同的淋巴细胞，可在未被致敏的情况下破坏外来细胞(如肿瘤细胞)。
Natural killer cells, which are a class of lymphocyte distinct from t cells and B cells, destroy foreign cells (eg, neoplastic cells) even without prior sensitization.
自然杀伤细胞是身体对抗病毒引起的病原体和癌细胞的第一道防线，这意味着降低自然杀伤细胞的功效将导致对癌症和某些病毒的敏感性增加。
NK cells are the body's first line of defense against viral pathogens and tumor cells, which means a decrease in their function can result in increased susceptibility to cancer and certain viruses.
NKT细胞是一种具有混合功能的细胞：它们既能如自然杀伤细胞般杀死入侵微生物，又能如t细胞般与抗原(能激发免疫反应的外源物质)结合。
NKT cells are hybrids: they kill invading microbes, like natural killer immune cells, but they also bind to antigens - foreign substances that trigger an immune response - like T-cells do.
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