Her schemes backfired on herself,and she lost her boyfriend forever.

她计划了她自己,从此永远失去了她男友。

His scheme backfired (on him) and he lost money.

他计划招来相反结果，他赔钱了。

The surprise I had planned backfired on me.

我设计好惊喜卻产生了适得其反后果。

His plan backfired on him, and he lost all his money.

他计划事与愿违, 因此他钱全亏掉了。

His scheme to win the girl backfired and she went to another guy.

他追求那女孩计划产生了反效果,现在她名花另有主。

The car backfired.

那辆车发生逆火现象。