It can't measure the difference between fat, muscle and bone. 它无法区分体内脂肪、肌肉和骨骼之间的差异。 And as humans age, muscle declines and fat builds up around the waist, often with no change in weight.

Examples I normally use a scale to measure the exact amount of flour I need for a cake. 我一般用秤来准确地测量做蛋糕所需要的面粉重量。 I have a new watch and it can measure my heart rate. 我有一个新手表，可以测量我的心跳。 Helen Determine 和 ...