一本正经的用英语怎么说？

一本正经的

例句

• Officious immigration and customs officers scrutinised documents and searched cabins for stowaways or illicit goods. 一本正经的边境和海关官员仔细检查文件,在车厢里搜索偷渡者和走私货物.
• His gravity made us laugh immoderately. 他那一本正经的样子,使我们笑得不可开交.
• Only when the last children had disappeared did Sister Agatha break her rigi d pose. 一等到孩子们全部走完,阿加莎修女就弃了她那僵硬的一本正经的假做作.
• He's quite a serious person... 他是一个非常一本正经的人。