translation.en: And a pig disease, a pig virus, and a human virus can both proliferate, and because of their kind of reproduction, they can combine and produce a new virus.
translation.zh: 而猪的疾病， 猪的病毒，和人类的病毒 都能繁殖并扩散。 正因为这种繁殖系统， 猪和人携带的病毒可能变异，并生成一种新病毒。