VOA慢速英语:英国批准牛津大学-阿斯利康新冠疫苗

dose –n. the amount of a medicine or vaccination needed to protect against or treat disease

rapid –adj. happening at a fast rate

alternative –adj. offering another choice

track –v. to follow and observe the progress of something

illness –n. sickness; disease

impractical –adj. not easy to do or use

recommend –v. to suggest an act or action

regulator –n. a group that is part of a government that can make and enforce rules related to public activity