这种可能引起安慰剂效应的“无效治疗”经常被作为对照组应用于临床试验，科学家依此判断被测药物的额外作用。

Dummy treatments that might elicit the placebo effect are often used in clinical trials as a comparison group to allow scientists to measure the additional effects of experimental medicines.

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设立常规药物治疗作为对照组。

Routine drug therapy was used as the control group.

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一组不经治疗作为对照组。

A group with no treatment served as control.

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