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VOA慢速英语:世界上最昂贵的药物是基因治疗 价值200万美元
2019-06-03来源:和谐英语
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infant – n.a baby or very young child
transformational – adj.able to produce a big change or improvement in a situation
significant – adj.important, large or great
milestone – n.an important event in the development or history of something
devastating – adj.causing great damage of suffering