VOA慢速英语:研究发现肥胖儿童人数急剧增加

Body Mass Index – n. a weight-to-height ratio, calculated by dividing one's weight in kilograms by the square of one's height in meters and used as an indicator of obesity and underweight.

decade – n. a period of 10 years

epidemic – n. a widespread occurrence of an infectious disease in a community at a particular time.

epidemiology – n. the branch of medicine that deals with the incidence, distribution, and possible control of diseases and other factors relating to health.

income – n. money received, especially on a regular basis, for work or through investments.

trend – n. a general movement

label – n. written or printed information on a product