That would make bats more abundant sources of virulent new viruses than other groups of mammals.

这会让蝙蝠成为比其他哺乳动物更丰富的新病毒来源。

At that time, his visibility was weak, so it was easy for her to mix vinegar with a virulent virus.

当时，能见度很低，她很容易就在醋里混了些剧毒的病毒。

So it's a much less virulent virus, but it's still a virus that causes mortality, and that's what we don't want entering human populations.

所以它是一种毒性低得多的病毒， 但它仍然是一种导致死亡的病毒，而这正是我们不希望进入人类的病毒。