百年不遇，汉语成语，读音是bǎi nián bù yù，意思为一百年也碰不到，形容很少见到或很少出现。出自《龙须沟》。
那里的旱情百年不遇。
过去一年来，我们经历了一场百年不遇的金融和经济危机。
We suffered a rare financial and economic crisis in the past year.
但一年后，与其它科技巨人一样，思科也遭受到了被钱伯斯先生称为“百年不遇的洪流”袭击。
But a year later, like other technology giants, it was hit by what Mr Chambers calls the "hundred-year flood".
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