VOA慢速英语:新冠疫苗或能对抗变种病毒

mutation –n. a change in the genes of a plant or animal that causes a different quality to be recognized

flip a switch –idiom to easily and quickly make a change

sample –n. a small amount of something that is used to give information about what it was taken from

recipe –n. a set of directions for making food

track –v. to follow and observe, especially in an effort to find evidence

genome –n. the total amount of genetic information in the chromosomes of an organism

variant –n. something that is different in some way from others of the same kind

cushion –n. something extra that can reduce bad effects or problems

spike –n. a sharp, thin structure that sticks out from something