As a simultaneous alternative to Vanguard, Wernher von Braun and his Army Redstone Arsenal team began work on the Explorer project.
作为一个同时替代先锋火星冯基布劳恩和他的陆军红石兵工厂队开始工作，对探险项目。
As a simultaneous alternative to Vanguard, Wernher von Braun and his Army Redstone Arsenal team began work on the Explorer project.
作为一个同时替代先锋火星冯基布劳恩和他的陆军红石兵工厂队开始工作，对探险项目。
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