VOA慢速英语:Screen Time: How Much Is Too Much?

screen – n. the surface on which the image appears in an electronic display

essential – adj. extremely important and necessary

data – n. factual information (as measurements or statistics) used as a basis for reasoning, discussion, or calculation

zero-sum game – phrase : a situation in which one person or group can win something only by causing another person or group to lose it : (Mathematics) (in game theory) a contest in which one person's loss is equal to the other person's gain

survey – v. to ask (many people) a question or a series of questions in order to gather information about what most people do or think about something : (– n.) an activity in which many people are asked a question or a series of questions in order to gather information about what most people do or think about something

negative – adj. harmful or bad : not wanted

delinquency – n. conduct that is out of accord with accepted behavior or the law

consume – v. to use (fuel, time, resources, etc.)

correlation – n. the relationship between things that happen or change together

interface – n. a system that is used for operating a computer : a system that controls the way information is shown to a computer user and the way the user is able to work with the computer