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There is nothing in the world so irresistibly contagious as laughter and good humor.

解讀：一次性快樂稍縱即逝，如短暫刺激；可重復(fù)的快樂源于內(nèi)心充實、自我成長，更值得投入精力，引導(dǎo)追求深度、持久快樂。

Laughter and tears are both responses to frustration and exhaustion. I myself prefer to laugh, since there is less cleaning up to do afterward.