They were randomized into 5 groups named blank control positive control low dosage experiment group moderate dosage experiment group and high dosage experiment group 8 rats in each one.

随机分为5组，空白对照组、阳性对照组、低剂量实验组、中剂量实验组和高剂量实验组，每组8只。

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In fact, their moods turned significantly darker than those of members of the control group, who weren't urged to think positive thoughts.

事实上，他们的情绪比对照组的人要低落得多，对照组的人没有被催促去想一些积极的想法。

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The new study illustrates how simple it would be for companies to control reviews of their products by simply adding a few positive ratings of their own early reviews in the process.

这项新的研究表明，企业要对其产品进行评控是多么简单，他们只需要在早期自行发表一些积极的评论即可。

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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

"We have positive control of these individuals, " he said.

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This system, Positive Train Control (PTC), is intended to stop or slow a train automatically if a driver goes too fast or passes a red signal.

ECONOMIST: American railways

It's a serious, deep-seated problem that FCC cannot explain why proprietary control over networks is fundamentally a positive thing and the source of genuine "neutrality" (that of "business model neutrality").

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