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The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair.
一个可能出错的东西和一个不可能出错的东西之间的主要区别是，当一个不可能出错的东西出错时，通常是不可能得到和修复的。