Sonja Lyubomirsky, an experimental psychologist at UC Riverside, found that people who once a week wrote down five things they were grateful for were happier than those who did it three times a week.

Riverside大学实验心理学家Sonja Lyubomirsky发现，一星期写一次五件自己觉得感激的事情的人们要比那些一星期写三次的人们更为快乐。

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