Be serious
作古正经───Be serious
The consequences could be serious.───后果可能是严重的。
Be serious for a moment; this is important.───严肃点儿，这件事很重要。
She asked me to be serious – said it put her off if I laughed.───她要我严肃一点–说如果我大笑会让她分心。
The kid , just sat before the computer and played the happy farm . I asked him to be serious and he pretended to hear nothing.───那个孩子，就是坐在电脑面前玩开心农场。我让他认真点，他却假装没听到。
And if they say, ah, you know, the United States and China, they're not serious about this, then they won't be serious either.───如果他们认为美国和中国并不认真对待这个问题，那么他们也就不会认真对待它。
"Something's happened on the line ahead" , said the driver, "it must be serious" . It was.───“前面好像发生了什么事情，”司机说，“的确很严重。”
You think I did it? Be serious!
Oh, please! You cannot be serious.
You can't be serious - is this a wind-up?