At first he decided to let the mild illness run its course.

开始他决定让这个小病听其自然。

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But most people get a mild illness and get better with little or no treatment.

但多数人患病轻微和很快好转，很少或不用治疗。

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But most people get a mild illness and get better with little or no treatment.

但多数人患病轻微和很快好转，很少或不用治疗。

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