我找不到酒瓶的软木塞了。

I can't find the ___stoppers for the wine bottles.

这位警察成为了犯罪团伙活动的阻止者。

The policeman became the ___stopper of the criminal gang's activities.

我们的后卫在比赛中成功地阻止了对方前锋的进攻。

Our ___stoppers effectively blocked the opposing striker's advances during the match.