This here shows, on the Y-axis, the increase in the probability that a person is obese given that a social contact of theirs is obese and, on the X-axis, the degrees of separation between the two people.
在这里可以看到，纵轴上代表的是 如果一个人的社会联系人中有人患有肥胖症的话， 那么这个人患有肥胖症的几率会增加多少； 横轴上代表的是，这两个人之间的分离指数。