To test their method, they conditioned these mice, as well as a control group, to fear a sound by pairing it with an electric shock.

为了检验他们的方法，研究人员对这些小鼠以及一个对照组播放某种声音并配以电击，使其形成害怕声音的条件反射。

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Method: 84 patients with gastroscopy were randomly divided to experiment group and control group, and 42 patients per group.

方法：将84例行胃镜检查的患者随机分实验组和对照组各42例。

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The control group used the traditional teaching method, the experimental group used the health education path table in health education.

对照组采用传统的宣教方法，实验组采用健康教育路径表进行健康教育。

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Menasche's initial trial of the method on ten patients showed tantalizing hints of efficacy, but because there was no control group, it is impossible to tell whether the improvements seen were due to the cell transplant or to the bypass surgery the patients also received.

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