我觉得这样才能反映出他们之间的关系啊.重叠部分可以看出这三个陈述之间的关系,如果不重叠就没有意义了.The circles in a Venn diagram are overlapped in order to show something that they have in common. In the case of three circles, the very center represents something that all three have in common and where only two of the circles overlap is where only those two have something in common that the third circle does not. 问了下老师,她这么回复的.
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