谢谢janeice65,我看到了Instead, we propose two scenarios that can plausibly explain the origin of SARS-CoV-2: (i) natural selection in a non-human animal host prior to zoonotic transfer, and (ii) natural selection in humans following zoonotic transfer. We also discuss whether selection during passage in culture could have given rise to the same observed features.
抱歉,刚刚没仔细您说的内容...我大部分认可您后面所写的内容。