What does "The sharp knife of a short life"mean?
It is in the song If I Die Young by Perry Band. Actually,I even don't know what the the theme expressed by the song is...

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It means something like how painfull it is knowing someones life is shut down by a tragedy. 
But maybe they have their own symbolic meaning of their lyrics.

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犹如利刃的苦短人生。

颇有人生苦短之意！

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