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[VOA慢速-科技报道] VOA慢速英语(翻译+字幕+讲解):NASA推迟火箭发射计划至2020年
NASA's large new rocket will not be ready for launch next year, the American space agency's top official said this week.2019-03-18 编辑:emma
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2019-03-18 编辑:emma