his inability to control his mirth他乐得无法抑制

That caused considerable mirth amongst pupils and teachers alike.那让学生和老师们都很高兴。

It was all he could do to stop tears of mirth falling down his cheeks.他唯一能做的就是不让欢乐的泪水滑落脸颊。

He was weeping with mirth.他喜极而泣。