a blind man will not thank you for a looking-glass.瞎子不谢赠镜人 a blunt knife may be sharpened on a stone, but if a man is stupid there is no help for his stupidity.
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瞎子不谢赠镜人
The blind do not thank the person who gave the mirror
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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