VOA慢速英语:人类胚胎基因修复有助于预防疾病

edit – v. to make changes, correct mistakes, etc., in something

defect – n. a problem or fault that makes someone or something not perfect

preliminary – adj. coming before the main part of something

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

devastating – adj. causing great damage or harm

affirm – v. to say that something is true in a confident way

enhance – v. to increase or improve (something)

evolution – n. the process by which changes in plants and animals happen over time

in vitro fertilization - n. fertilization of an egg in a laboratory dish or test tube

plague – v. to cause constant or repeated trouble, illness, etc.,