前车之鉴的英文：
[Literal Meaning]
former/cart/aux./mirror
the lesson drawn from the (overturned) cart ahead

[解释]
以前的失败，可以作为以后的教训。

[Explanation]
lessons drawn from others' mistakes

[例子]
上一次营销活动的失败就是我们的前车之鉴，这一次我们一定要好好计划。

[Example]
The failure of our last promotion is our deterrent example and we must make good plans this time.

One man's fault is other man's lesson
前车之鉴

By other’s faults wise men correct their own. ——Ling
智者以前车之鉴改正自己的错误。——陵

It may be that your sole purpose in life is simply to serve as a warning to others.
你存在的惟一目的可能仅仅是充当其他人的前车之鉴。