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

她划害了她自己,从此永远失去了她男友。

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

他划招来相反结果，他赔钱了。

The surprise I had planned backfired on me.

好惊喜卻产了适得其反后果。

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

他划事与愿违, 因此他钱全亏掉了。

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

他追求那女孩划产了反效果,现在她名花另有主。

The car backfired.

那辆车逆火现象。