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VOA慢速英语:新冠疫苗接种开始于美国的历史性努力?
2020-12-15来源:和谐英语
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dose –n. the amount of something, such as a medicine, needed to be effective
applause – n. the show of approval when people strike their hands together
exhausted – adj. very tired, used up
tunnel – n. a passage underground
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