In autoimmune diseases, like arthritis or Crohns disease, t cells mistake fragments of the body's own cells for foreign invaders, leading to the body launching an attack upon itself.

在自身免疫系统疾病中，如关节炎或克隆恩氏病，T细胞误把自身细胞碎片当作外来入侵者，导致自己攻击自己。

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If the lysosomes cannot provide bits of the bacteria for display on the cell surface, patrolling t cells will not recognize that a cell harbors invaders.

溶小体未能将披衣菌碎片呈现在细胞表面，巡逻的T细胞便不晓得哪个细胞窝藏了入侵者。

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It also mobilizes t cells to attack the invaders or, more importantly, infected cells.

同时还动员T细胞攻击侵入者，更重要的是，被感染的细胞。

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Two specific types of immune system cell that attack invaders - CD4 T-cells and natural killer cells - increased in number with age, with a higher rate of increase in women than in men.

BBC: Biological clue to why women live longer than men

They didn't get there by simply offering Space Invaders to 11-year-old boys.

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