VOA慢速英语:研究显示2030年将有近半数美国人患上肥胖症

trend – n. a general direction of change : a way of behaving, or proceeding, that is developing and becoming more common

survey - 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

alarm – n. a warning of danger

diabetes – n. a serious disease in which the body cannot properly control the amount of sugar in your blood because it does not have enough insulin

elevation – n. the height of a place

altitude – n. the height of something (such as an airplane) above the level of the sea