Out of the seven original Mercury astronauts, three of them were selected as candidates for the first manned U.S. spaceflight: John Glenn, Gus Grissom and Shepard.
从7位最初的水星宇航员中，其中三位被选为第一次美国载人航天的候选人：约翰.格伦,加斯.格里森和谢泼德。
Out of the seven original Mercury astronauts, three of them were selected as candidates for the first manned U.S. spaceflight: John Glenn, Gus Grissom and Shepard.
从7位最初的水星宇航员中，其中三位被选为第一次美国载人航天的候选人：约翰.格伦,加斯.格里森和谢泼德。
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