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[2016年上半年VOA常速英语] VOA常速英语(翻译+字幕+讲解):成为NASA宇航员需要何种资质?
NASA对宇航员的资质有何要求呢?选拔一定很严格吧?需要经过哪些培训呢?一览文章见分晓!2016-06-20 编辑:Emma
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2016-06-20 编辑:Emma