When European explorers and travelers spread out, they brought with them the germs that they had become essentially immune to, that they had learned how to tolerate over hundreds and hundreds of years, thousands of years, of living with domesticated animals who were the sources of those pathogens.
当欧洲的探险家和旅行者们分散出去 他们也随身带去了 他们已经形成免疫的细菌 他们已经可以相安无事了 成百上千年来， 他们同带有病原体的驯养的动物们一起生存