时而发出笑声
Break into laughter
以上为机器翻译结果，长、整句建议使用 人工翻译 。
广场中央有许多老年人在跳舞，还有的在高谈阔论，时而发出一阵阵快乐的笑声。
There are many elderly people in the central square dancing, as well as in rhetoric, sometimes issued by waves of happy laughter.
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他们在观看卓别林的一部电影时，时而不时地爆发出一阵笑声。
They burst out laughing now and then while watching one of Charlie Chaplin's films.
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