
> Por que os humanos riem? Esta é uma pergunta muito difícil de responder.
Since this sentence is a translation of the English, which uses the word "smile", the word "riem" should be replaced by "sorriem".
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This sentence was initially added as a translation of sentence #1246419
added by alexmarcelo, November 19, 2011
linked by alexmarcelo, November 19, 2011