You know how flu viruses mutate.
你知道病毒如何发生变异。
The virus did not mutate to a more virulent form.
病毒没有变异为致命性更强的形态。
But they can make larger leaps.They also mutate as they go.
但是它们也能有更大的飞跃。它们移动的同时也在变异。
The virus could still mutate to become more severe, she warned.
她警告说，病毒仍有可能变异，变得更厉害。
Scientists warn that the virus could mutate into a much deadlier form.
科学家们警告，该病毒可能变异成更致命的形式。
But why do those genes mutate in the first place?
但为什么这些基因会发生变异呢？
The virus could still mutate to become more severe, she warned.
她警告说，病毒仍然有可能变异，变得更厉害。
The virus could still mutate to become more severe, she warned.
她警告说，病毒仍然有可能变异，变得更厉害。
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