Laughter is a good antidote to stress.

笑是消除压力的良方。

They were rolling about with laughter.

他们笑得摇摇晃晃地走着。

The three of them collapsed with laughter.

他们三人笑得前俯后仰。

Billy started to double up with laughter.

比利笑得腰都直不起来了。

His laughter stopped as quickly as it had begun.

他笑得快停得也快。