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本期内容：
Precise "chemical surgery" has been performed on human embryos to remove disease in a world first, Chinese researchers have told the BBC.
The team at Sun Yat-sen University used a technique called base editing to correct a single error out of the three billion "letters" of our genetic code.
The team says the approach may one day treat a range of inherited diseases.
Precise：准确的
Surgery：手术
Embryo：胚胎
Genetic code：基因密码
Inherited disease：遗传疾病
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