VOA慢速英语:世卫组织称看屏幕时间太长不利于儿童

screen(s) – n. the part of a television, computer or other device that you look at when you are using it

caution(ing) – v. to warn or tell someone about a possible danger or problem

recommend(s) – v. to suggest that someone do something

sedentary – adj. doing or involving a lot of sitting

cycling – n. riding a bicycle

benefit(s) – n. a good or helpful result or effect

proportionate – adj. having a size, number, or amount that is directly related to or the best fit for something

body mass index – n. a measurement that shows the amount of fat in your body and that is based on your weight and height