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单词 comparison group
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A University of Michigan study had one group of participants take a 60-minute snooze, while a comparison group watched a nature documentary.

密歇根大学的一项研究让一组实验参与者小睡60分钟,而另外一组则观看了一部自然纪录片。

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The study had no comparison group, but researchers said the results compare well to historical data for similar patients who had radiation.

尽管这项研究没有设对照组,但研究人员表示,他们的研究结果相比之下不亚于接受放疗的类似患者的历史数据。

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He noted that since the study did not have a comparison group getting regular ECG measurements, there is no way of knowing if the device missed heartbeat problems.

他指出,研究并未让对照组接受常规心电图测试,所以无法知道该设备是否有错过的心跳问题。

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