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过去每一百年内会发生三至四次的全球大型传染病疫潮。
Every hundred years there have been three or four pandemics.
youdao
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过去每一百年内会发生三至四次的全球大型传染病疫潮。
Every hundred years there have been three o 'r four pandemics.
youdao
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过去每一百年内会发生三至四次的全球大型传染病疫潮。
Every hundred years there have been three o 'r four pandemics.
youdao