Heads Up These sentences are mainly from the Tanaka Corpus and Tatoeaba project. Read more

Why do humans laugh? That's quite a difficult problem.
なぜ、人間は笑うのかという問題、これは、なかなかむずかしい問題であります。  

Alternative Translations

何故、人間は笑うのかという問題、これは、なか/\むつかしい問題であります。

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