慢速英语:研究称美国人同意基因编辑只出于健康目的

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editing – n. the process of making changes to something

DNA – n. a substance that carries genetic information in the cells of plants and animals

chronic – adj. a substance that carries genetic information in the cells of plants and animals

toll (that has) taken – idiom. a serious, bad effect something has on another thing

replace – v. to put someone or something new in the place or position of someone or something

sperm – n. a cell that is produced by the male sexual organs and that combines with the female's egg in reproduction

guideline(s) – n. a rule or instruction that shows or tells how something should be done

fertility clinic(s) – n. a place where people get medical help for issues with their ability to produce children

versus – adv. used to show two different things or choices that are being compared or considered

cosmetic – adj. not important or meaningful

confidence – n. a feeling or belief that someone or something is good or has the ability to succeed at something