搭便车可以通过打破陌生人之间的隔阂，增进彼此的尊重。

Hitchhiking would increase respect by breaking down barriers between strangers.

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小小免费图书馆也可以大大改善邻里关系和陌生人之间的关系。

Little Free Library can greatly improve the relationship among neighbors and strangers, too.

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其中需要许多陌生人之间的互相信任。

This involves getting lots of strangers to trust each other.

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Call it generosity between two strangers.

你可以称为陌生人之间的慷慨解囊。

哈佛公开课 - 幸福课课程节选