Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
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
