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VOA慢速英语:Moderna已向美国申请新冠疫苗紧急使用授权
2020-12-01来源:和谐英语
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phase - n. a step in the process
dose - n. the amount of medicine that is taken at one time
regulator - n. a government official that controls a public activity by making and enforcing rules
participant - n. a person who is involved in an activity
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