| 字词 | 前功尽弃 |
| 释义 | 前功尽弃 熟 all that has been achieved is spoiled; all the previous efforts are wasted 大坝一定要在雨季到来前合拢，否则就会前功尽弃。The dam must be closed before the rainy season sets in, or all our labour will be lost. |
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