他是唯一一个同时参加过“水星”“双子星”和“阿波罗”先遣计划的宇航员。
He was the only astronaut who flew in three of the nation's pioneering space programs: Mercury, Gemini and Apollo.
他是唯一一个同时参加过“水星”“双子星”和“阿波罗”先遣计划的宇航员。
He was the only astronaut who flew in three of the nation's pioneering space programs: Mercury, Gemini and Apollo.
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