Not all aspects of citizen control have been positive.
并不是所有市民控制的方面都是正面的。
2
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。
3
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.