So, this is a cell that's infected with a microorganism,

这是一个感染了微生物的细胞
it's infected with a virus,

它感染了一种病毒
let's say it's infected with influenza virus.

就说是感染了流感病毒吧
That virus is reproducing inside cells of your respiratory tract.

病毒在你的呼吸道细胞内繁殖
You've got the flu,

你就此得了流感
you've got influenza in your upper respiratory tract,

你得了上呼吸道流感
your cells are making more influenza.

你的细胞正在制造更多流感病毒
That gets presented in the context of MHC1 on cells within your body.

在体内病毒同MHC1共同呈递
Immune cells recognize it, and

免疫细胞识别出染病细胞
they recognize it by a very special form of

通过一种特殊形式的
receptor-ligand interaction

受体配体协作机制识别出来
where the ligand is MHC1

其中的配体是同