It simply assigns you a number based on your height and your weight, leaving out such trivialities as lean muscle mass, body fat, basal metabolic rate, and other medical parameters.

• 它让你简单地填写你的身高，体重，避开了那些繁琐的肌肉组织，体脂肪，基本新陈代谢率，以及其它医疗参数的测量。