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在大流行期间这一病毒没有突变为某种更致命的形式。
The virus did not mutate during the pandemic to a more lethal form.
youdao
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因为某种致命的病毒，只用了4天，她就走了。
She left so quickly because some virulent virus, only four days.
youdao
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因为某种致命的病毒，只用了4天，她就走了。
She left so quickly because some virulent virus, only four days.
youdao