body mass index
noun [ C ] uk/ˈbɒd.i ˌmæs ˌɪn.deks/ us/ˈbɑː.di ˌmæs ˌɪn.deks/ (abbreviation BMI)
体重指数(通过身高与体重的关系，衡量是否肥胖的一种标准)
a measurement of a person's weight in relation to their height, used to find out if they are too fat
Obesity for adults was defined as a body mass index of 30 or greater. 成年人肥胖定义为体重指数达到或者超过30。