成语词典进退有常常:规律。前进和后退都有规律。拼音jìn tuì yǒu cháng解释常:规律。前进和后退都有规律。出处《鹖冠子·泰鸿》:日信出信人,南北有极,度之稽也,月信死信生,进退有常,数之稽也。例句唐·白居易《答高郢》:而能始终有道,~;援礼引年,遗荣致政。用法作谓语、宾语;前进和后退都有规律