追悔莫及

Explanation: Sorry too late. 　　Usage: The main predicate; as predicate, object; containing derogatory 　　Source: Han Chao Cuo "letter made military matters," the death of her husband's competitiveness in people, or the weak, the regret of the death and also. " Thesaurus:  spare no pains, Not report labor, zealously and earnestly, work hard and not be upset by criticism; willingly bear the burden of office, bear the burden and heat of the day, Remorse, to regret a previous mistake, It will be too late to regret (often used in warning or dissuading somebody, Huizhiwuji, Regret of less than, Office workers of any blame, be full of remorse