So, there's all kinds of bacteria on the Earth that have no business being in you or on you at any time, and if they are, they make you incredibly sick.
地球上有无数种细菌 它们有些在任何时候都绝对不应该出现在你的体内体表， 然而假如你不幸遇到了, 那你一定会病得很厉害。