一个新菌株的猪流感病毒表示，流感流行的变种，若从人跳回到猪身上，就会以新的和不可预知的方式继续演变。

A new strain of swine flu shows that the pandemic version has jumped from humans back to pigs, where it's evolving in new and unpredictable ways.

youdao

一个新菌株的猪流感病毒表示，流感流行的变种，若从人跳回到猪身上，就会以新的和不可预知的方式继续演变。

A new strain of swine flu shows that the pandemic version has jumped from humans back to pigs, where it's evolving in new and unpredictable ways.

youdao