In most previous pandemics, the new virus has totally replaced the previously circulating strains.

过去的几次流感大流行中，流行的新病毒株都完全替代了过去的旧病毒。

youdao

In most previous pandemics, the new virus has totally replaced the previously circulating strains.

过去的几次流感大流行中，流行的新病毒株都完全替代了过去的旧病毒。

youdao