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。