| 单词 | 十年九不遇 | 
| 释义 | 十年九不遇十年九不遇[shí nián jiǔ bú yù]1.■not occur once in ten years; be seldom seen; be very rare; hard to meet in many years:这样大的洪水真是十年九不遇。A flood of this sort is really unprecedented. | 
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