举个很简单的例子，假设两匹斑马经常在一起闲逛，然而有第三者有一半的时间跟他们在一起 ，那这第三者是否属于它们这一部分呢？
To take a very simple example, suppose that two zebras always hang out together, while a third is with them half the time. Is the third zebra a part of the group or not?
举个很简单的例子，假设两匹斑马经常在一起闲逛，然而有第三者有一半的时间跟他们在一起 ，那这第三者是否属于它们这一部分呢？
To take a very simple example, suppose that two zebras always hang out together, while a third is with them half the time. Is the third zebra a part of the group or not?
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