教室里充满了欢快的笑声，因为孩子们都是天生的爱笑者。

The classroom was filled with joyful sounds as children are natural ___laughers.

这场比赛对我们队来说简直就是小菜一碟，我们轻松领先15分。

The match was a ___laughter for our team as we led by 15 points easily.