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痛改前非 ------------- thoroughly rectify his errors
例句：
A: Carl swore he would thoroughly rectify his errors.
卡尔发誓他要痛改前非。
B: Really? That's the way it should be.
真的吗？应该这样。
同义词：
sincerely mend one's ways
注释：
That's the way it should be. 应该这样。
adv. 真诚地，真心地
