For some behaviors, such as smoking or drinking, the direct network effect is quite apparent, Fletcher says.

对于一些行为如吸烟或饮酒来说，直接的网络效应相当明显，弗莱彻说。

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Doctors can get an inkling by questioning people about their age, diet, infrequency of exercise and smoking habits—but it is only an inkling, not a direct measurement.

医生可以通过询问病人的年龄、饮食、锻炼的频率以及吸烟的习惯得到初步印象——但这仅仅是初步印象，并不是直接测量。

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For some behaviors, such as smoking or drinking, the direct network effect is quite apparent, Fletcher says. But for others, such as obesity, the case is less clear.

不过对于某些行为(比如吸烟、喝酒)来说，社交圈的直接影响十分明显，但对于肥胖来说就不那么明显了。

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