be poker-faced;become serious;humourless;in all seriousness;humorlessness ;

You have to wonder how anyone could say that seriously and with a straight face.
你一定会惊奇怎么会有人能绷着脸、一本正经地说出那些话。
来源:《柯林斯高阶英汉双解学习词典》Every solemn, " official " utterance can be paired with another that is sharply irreverent.
有一本正经的 “ 官方 ” 意见,就有另外一种玩世不恭的意见.
来源:词典精选例句In a pinstriped suit he instantly looked like a stuffed shirt.
穿上一套细条纹西装后,他马上就显得一本正经起来。
来源:《柯林斯高阶英汉双解学习词典》The'Eastern'Mark Twain can be delicate to the point of prudery.
“ 东部的 ” 马克·吐温竟可以严谨到一本正经的程度.
来源:词典精选例句Our unconventional behaviour did in fact shock some of our more straitlaced friends.
我们这一不合常规的行为实际上着实让我们的一些一本正经的朋友吓了一大跳。
来源:《柯林斯高阶英汉双解学习词典》Why were grown-ups always so stuffy and slow to recognize good ideas?
为什么成年人总是那么一本正经,对好点子反应那么迟缓呢?
来源:《柯林斯高阶英汉双解学习词典》We were afraid he would be serious on stage, but in the event he performed beautifully.
我们担心他在台上会一本正经, 可是结果他演得精彩极了.
来源:《简明英汉词典》He grandly declared that "international politics is a struggle for power".
他一本正经地宣称“国际政治是一场权力之争”。
来源:《柯林斯高阶英汉双解学习词典》Atnold was rigid in the company of children, with almost everybody.
阿诺德与孩子们在一起时总是一本正经, 几乎对所有孩子都是这个样子.
来源:词典精选例句
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