They are grave or impertinent all the day long.

他们这一天里不是庄严肃穆就是嬉皮笑脸.

辞典例句

Don't trifle with me.

别跟我嬉皮笑脸的.

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You should be serious in class. Don't behave in a noisy , gay , and boisterous manner.

你上课要严肃, 不准嬉皮笑脸.

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He was indeed a thoughtless, giddy youth, with little sobriety in his manners incountenance.

他确实是个轻率 、 浮躁的少年, 举止随便,嬉皮笑脸.

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We are like a group of army deserters, Xipixiaolian day, and sometimes instructors let us laugh.

我们就像一群逃兵, 整天嬉皮笑脸, 有时教官也让我们逗笑了.

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Get on with your homework – and I want none of your sauce.

做你的功课去,不要这么嬉皮笑脸的.

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