Researchers asked a group of college students record their moods, take photos and report their emotional state over the course of four weeks.

研究人员让一群大学生在四周的时间内记录心情，拍照并报告自己的情绪状态。

The project involved three types of photos to help the researchers determine how smiling, reflecting and giving to others might impact users' moods.

为了帮助研究人员确定微笑自拍、拍摄他物、拍照送人是如何影响人的心情，这一项目涵盖了三种照片类型。

The first was a selfie, to be taken daily while smiling, then a snap of something that made them happy and the third was a picture of something the photographer believed would bring happiness to another person (which was sent to that person).

第一种是人们平时拍下的微笑自拍，第二种是人们抓拍到的有趣事物照片，第三种是摄影者拍下的认为会给他人带来快乐的照片 The team collected close to 2,900 mood measurements during their study and found that subjects in all three of the photo groups experience increased positive moods.

该团队在研究中收集了将近2900种情绪测量数据，发现三种照片类型中的人都会拥有更多的乐观情绪。

Some in the selfie group reported being more confident and comfortable with their smiling photos over time.

报告显示，自拍组的一些学生在微笑自拍的时候会更加自信，心情更加愉快；

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