1. 笑声
    Laughter is the sound of people laughing, for example because they are amused or happy.

    e.g. Their laughter filled the corridor...
           整个走廊都回荡着他们的笑声。
    e.g. He delivered the line perfectly, and everybody roared with laughter.
           那句台词他拿捏得恰到好处，引得众人哈哈大笑。

2. 笑；快乐
    Laughter is the fact of laughing, or the feeling of fun and amusement that you have when you are laughing.

laughter

    e.g. Pantomime is about bringing laughter to thousands...
           圣诞童话剧旨在把欢笑带给千千万万的人。
    e.g. My interests: eating out, fun nights in, music and laughter.
           我的爱好是：到外面上馆子，晚上在家娱乐，听音乐，寻乐子。