nemesis|nemeses

蝙蝠侠和小丑是彼此的死敌。

Batman and The Joker are each other's ___nemesis.

这位侦探一生都在追捕他的宿敌。

The detective spent his life chasing his ___nemeses.

哈利·波特最终击败了他一生的宿敌伏地魔。

Harry Potter finally defeated his lifelong ___nemesis, Voldemort.