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About laughter关于笑 A:Hey!What’s up? B:I am watching Mr.Bean. A:Cool!You know,everytime I Watch it,I am in stitches[忍俊不禁] B:Yeah.I just can’t keep a straight face[板着面孔, 不露笑容].I once got into trouble because of Mr.Bean. A:Really?What happened? B:I burst out