Question

以铜为鉴，可以正衣冠；以人为鉴，可以明得失；以史为鉴，可以知兴替 请高手用英文翻译一下

Answer 1

Bronze-made mirror contributes to setting one's dressing right, and predecessor-set mirror benefits understanding gain and loss(success and failure亦可，但前者更文雅), while histroy-based one helps to see through ups and downs(史海沉浮，朝野交替，rise and fall亦可，个人推荐前者，似更通俗)。

注：
1.铜，铜质、铜制的，古人以铜为材磨镜；本义copper，更专业的（考古）术语为bronze(-based) mirror
2.鉴，镜子
3.人，前人，古人

Answer 2

Take copper as a mirror, I can tidy up my clothes;
take people as a mirror, I will know what I do is right or not;
take history as a mirror, I will know how the things rise and fall.

【来自网络】