慢速英语:癌症是富裕国家的主要死因

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

prospective – adj. likely to be or become something specified in the future

urban – adj. of, relating to, or being a city

rural – adj. relating to the country, country people or life, or agriculture

epidemiology – n. a branch of medical science that deals with the incidence, distribution, and control of disease in a population

income – n. a gain usually in money that comes in from labor, business, or property

data – n. acts or information used usually to calculate, analyze, or plan something

mortality – n. the number of deaths that occur in a particular time or place

transition – n. a change from one state or condition to another

factor – n. something that helps produce or influence a result : one of the things that cause something to happen