behave in a noisy, gay and boisterous manner;disgusting [slobbering;sloppy] appearance;grinning cheekily ;

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.
来源:网络文摘精选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.
来源:网络文摘精选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.
来源:互联网摘选
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