Humankind clearly did something wrong: we invaded wild animals 'habitats, allowing many animal-borne pathogens that did not cause disease in animals to wreak havoc in human populations. Such diseases include Aids, ebola, hanta fever, yellow fever, malaria, and so forth.
人類作了一件不太好的事，就是侵犯了野生動物的棲息地，很多原本不會造成動物發病的病原菌，傳到了人類身上就成了病原，像愛滋、伊波拉、漢他、黃熱病、瘧疾等。