The wise man replied, "Because I left the stick that I had used to measure my feet at home."
智者回答说：“因为我把量脚的棍子忘在家里了。”
2
Different trainers will measure you in different ways, so stick with the same person each time and make sure the person is very experienced in measuring body fat.
不同的训练师会用不同的方法测量，所以每次用同一个人，同时确认那个人是在体脂测量上非常有经验的。
3
One obvious reason: Businesses are more likely to stick with Twitter if they're able to measure and improve upon the effectiveness of their marketing efforts.