VOA慢速英语:英国研究辉瑞疫苗引起的过敏反应

allergy - n. a medical condition that causes someone to become sick after eating, touching, or breathing something that is harmless to most people.

significant - adj. large enough to have an effect or to be noticed

participant - n. a person who is involved in an activity or event

regulator - n. government official who controls a public activity by making and enforcing rules

monitor - v. to watch, observe, listen to and check something for a purpose over a period of time