Separate negative control group, positive control group.

另设阴性对照组、阳性对照组。

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Marrow in positive control group was hypoplastic or marked hypoplastic, and morphology of granulocyte series was abnormal.

阳性对照组骨髓中有核细胞增生减低及明显减低，粒细胞系统形态异常。

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Compared with negative control group, the doubling time of both positive control group and experimental groups was prolonged.

与阴性对照组比较，阳性对照组和实验组细胞群体倍增时间增加。

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And that group did much better on the learning task than the control group, because they were put into a positive mood.

第二组,在学习任务上比对照组表现更好，因为他们被置于积极情绪。

哈佛公开课 - 幸福课课程节选

Last week, two studies from Sweden found that one hour a week of hypnotherapy for 12 weeks eased symptoms of irritable-bowel syndrome in 40% of patients (compared with 12% in a control group) and that the positive effects can last as long as seven years.

WSJ: Medical Hypnosis: You Are Getting Very Healthy