When a group of people are exposed to a virus or food toxin, modern medicine examines only those who get sick.

当一群人暴露于病毒或食物毒的时候，现代医学仅仅检测那些生病的人。

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When a group of people are exposed to a virus or food toxin, modern medicine examines only those who get sick.

当一群人暴露于病毒或食物毒的时候，现代医学仅仅检测那些生病的人。

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