How to say to laugh happily/a belly-laugh in Chinese 欢笑

何必强颜欢笑呢。 ( Why bother to laugh. )

到处是欢笑的人群 ( Laughing crowds everywhere )

短片记录下运动员的欢笑和泪水。 ( The short film records the laughter and tears of the athletes. )

强颜欢笑，取悦于人。 ( Make people laugh and please others. )

欢笑情如旧，萧疏鬓已斑。 ( The laughter is as usual, Xiao Shuzhen has spotted. )