live and learn

I shouldn't have agreed to that contract without legal advice—live and learn.我不该在没有征求法律意见的情况下就签下那份合同——吃一堑长一智吧。

He made the same mistake twice before finally applying the lesson—but as they say, live and learn.他在吸取教训前犯了两次同样的错误——但正如人们所说，吃一堑长一智。