To date, public health has eradicated only one disease - smallpox.

至今为止，在公共卫生方面只根除了一种疾病——天花。

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Tests to date had found no evidence of this disease in sheep.

到目前为止的试验还没有发现羊得这种病的迹象。

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Tests to date had found no evidence of this disease in sheep.

到目前为止的试验还没有发现羊得这种病的迹象。

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