这场足球比赛采用淘汰制，输一场就会被淘汰。

The football tournament is a ___knock-out competition where losing teams are eliminated.

那辆新车真是令人惊艳。

That new car is a real ___knock-out.

他在第一回合就被对手一记重拳击倒，直接KO了。

He suffered a ___knock-out in the first round after taking a heavy punch from his opponent.