VOA慢速英语:多亏了科技 学生们才能主导自己的体育课

o'clock – adv. as stated, reported, or recorded by the clock

virtual – adj. existing or occurring on computers or on the Internet

accountability – n. the condition of being required to explain actions or decisions to someone

bicycle – n. a 2-wheeled vehicle that a person rides by pushing on foot pedals

elective – adj. used to describe a class that is not required in a particular course of study

calorie(s) – n. a unit of heat used to indicate the amount of energy that foods will produce in the human body

practice – n. a regular occasion at which you do something again and again in order to become better at it

trend – n. a way of behaving or proceeding that is developing and becoming more common

concept(s) – n. an idea of what something is or how it works

context – n. the group of conditions that exist where and when something happens