adversary

对手、敌手正式

She finally beat her longtime adversary in the final round.

她终于在决赛中击败了长年的对手。

敌人、仇敌正式

The two countries were bitter adversaries for over thirty years.

这两个国家有三十多年的时间互为死敌。

对抗式的、敌对的法律

Our courts rely on an adversary system to test the evidence.

我们的法院采用对抗制来检验证据。