translation.en: Now, I had been working on other topics: the emergence of infectious diseases, which come out of the natural ecosystems of the Earth, make a trans-species jump, and get into humans.
translation.zh: 我一直都在研究其它的课题： 传染病的诞生 它们源于地球的自然生态系统， 跨越种族，传染给人类。