Ministry of Education《Dictionary of Chinese Idioms》

Homepage〉Idiom search〉辭典附錄〉書證待考參考詞語表〉[於事無補]

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Idiom	於事無補(無濟於事)
Source	中國成語大辭典漢英對照成語辭典
Ref. words	無濟於事
Appendix	書證待考參考詞語表