• Americans spend the most time out of any other people in the world volunteering in average four hours a week, volunteering outside their job which may also have a social objective more than any other people in the world.

    比其他任何人所花的时间都多,平均每周有四个小时做志愿者的工作,做与自身工作无关的善事,他们比世界上其他人更具社会目标。

    哈佛公开课 - 幸福课课程节选

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