[批改, pī gǎiㄆㄧ ㄍㄞˇ] to mark (homework, exam scripts etc); to correct and criticise (an article); to check; to correct; a correction (to a piece of writing)#38582
[痛改前非, tòng gǎi qián fēiㄊㄨㄥˋ ㄍㄞˇ ㄑㄧㄢˊ ㄈㄟ] completely correcting one's former misdeeds (成语 saw); to repent past mistakes and turn over a new leaf; a reformed character#64263
[中俄改订条约 / 中俄改訂條約, Zhōng É gǎi dìng tiáo yuēㄓㄨㄥ ㄜˊ ㄍㄞˇ ㄉㄧㄥˋ ㄊㄧㄠˊ ㄩㄝ] Treaty of Saint Petersburg of 1881, whereby Russia handed back Yili province to Qing China in exchange for compensation payment and unequal treaty rights