VOA慢速英语:英国研究人员计划感染健康志愿者来研究新冠病毒

pandemic – n. the fast spread of an infectious disease over a wide area or large part of the world

challenge - n. a difficult task or problem : something that is hard to do

enormously –adv. to a very great size, amount or extent

funding – n. money given to a group or organization

stage - n. a particular point or period in the development of something

ethics – n. rules of behavior based on ideas about what is morally good and bad

expose - v. to cause someone to experience something or to be influenced or affected by something

monitored –adj. related to being watched or observed over a period of time for a special purpose such as a medical one

trauma – n. a very difficult or unpleasant experience that causes someone to have mental or emotional problems usually for a long time

mild – adj. not harsh or severe