！mad副词是madly和名词是madness ，madness中文意思是n. 疯狂；愚蠢的行为

Where do you draw the line between genius and madness?天才和疯狂之间如何划界呢？

We're both alike – there is a streak of madness in us both.我们两个很像–我们两人都有一种疯狂的性格特征。