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单词 group comparison
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VOA Special 2022年6月合集

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。

VOA慢速英语_科技

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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