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劳而无功

【意思解释】词语解释 láo ér wú gōng ㄌㄠˊ ㄦˊ ㄨˊ ㄍㄨㄙ 劳而无功（勞而無功） ◎ 劳而无功 láo’érwúgōng[bay the moon;work hard but to no avail;accomplish little; fool's errand; milk the bull; preach to the winds wash a blackamor white] 费了力气但没收到成效 与不可,强