Body mass index,or BMI, is a measure of a person's weight in relation to height.

VOA: special.2011.02.15

First is the body mass index, you're going to see this a lot and you--some of you probably know about it already because it's out there in the popular literature.

首先是体重指数,我们会经常碰到这个概念,你们也许已经知道这个概念了,它经常在科普读物中出现

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

The World Health Organization defines obesity as a body mass index of thirty or more.

VOA: special.2011.02.15