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

她计划害她自己,从此永远失去她男友。

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

他计划招来相反结果，他赔钱。

The surprise I had planned backfired on me.

我设计好惊喜卻适得其反后果。

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。

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

他追求那女孩计划反效果,现在她名花另有主。

The car backfired.

那辆车发逆火现象。