"Natural selection can't call things into existence just because they are desirable, " says Tattersall, one of the deans of human evolutionary research. "Novelties happen randomly."
人类进化研究院的院长塔特索尔说，自然选择不能让令人喜欢的东西自行存在
Most such novelties will be evolutionary failures, but occasionally one will prosper and, because it is so new, its hosts’ immune systems will be unprepared for it.
虽然大部分新病毒的产生都以失败告终，但偶尔也会成功并迅速壮大。
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