There's a very thin dividing line between joviality and hysteria.

快活和歇斯底里间的界线十分模糊。

This remark sobered the father's joviality, and brought his mind to business.

这句话使父亲的愉快心情平静下来，他的心思又回到了工作上。

His modesty [air of joviality] was all put on.

他的谦逊[愉快的样子]都是装出来的。

There's a very thin dividing line between joviality and hysteria .

激动和歇斯底里之间就一线之隔。

Traditional Chinese weddings place an emphasis on celebration and joviality.

中国传统的婚宴布置强调：喜庆、热闹。