The key to happiness is to keep yourself busy, according to researchers from the University of Chicago.

芝加哥大学的研究人员表示，快乐的秘诀是使自己处于忙碌的状态。

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Relationships are the key to happiness.

各种关系是幸福的关键所作。

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The key to happiness is to choose happiness.

幸福的关键就是去选择幸福。

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The key to happiness is to dwell as little as possible on that downside.

FORBES: Why Keeping Your Options Open Is Really, Really Bad Idea

LONDON, England (CNN) -- The key to happiness, productivity and popularity at work has been revealed.

CNN: Helping yourself by helping others

Because social connections are a key (perhaps the key to happiness), the fact that Twitter technology connects people makes this effect even more intense.

FORBES: 8 Reasons Why Twitter Can Boost Your Happiness.