这两人成了死敌。用英语怎么说？

这两人成了死敌。

The two became deadly enemies...

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

two

n. 两个，两个东西，两点钟，一对；adj. 两个的，我

例句
He has been absent from his desk for two weeks...
他已经有两个星期没有坐在办公桌前了。

became

v. 变为，成为（ become的过去式 ）；

例句
It became very clear that the incident was not just an aberration, it was not just a single incident.
事实已经很清楚，这件事不是偶发的，它并不是一起孤立的事件。

deadly

adj. 极端的，非常的，致命的，致死的，非常有效的，如死一般的；adv. 极其，非常，死了一样地；

例句
She took the gun and blazed away with calm and deadly accuracy.
她拿起枪，冷静地连续射击，弹无虚发。

enemies

n. 仇敌( enemy的名词复数 )，敌军，危害物，大

例句
Old enemies can become new friends even if all their national interests are not in complete accord.
即使国家利益不尽相同，他们也可以化敌为友。