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，因为他们没有被要求积极思考。

Let's think positive.

咱们往好的方面想吧。

Think positive thoughts.

积极地思考。

It's so important to think positive.

她说：“乐观的态度非常重要。”

Think positive and you'll feel good too.

想法积极，自己的感觉也会很好。