前苏联捷足先登，首先将人造卫星Sputnik送人太空；美国后来者后勇，开展了“水星计划”(The Mercury Program)，为此美国宇航局（NASA）研究开发了一系列新技术，其中包括一款性能出众、精准可靠且无惧任何极端环境的计时腕表。
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The capsule was part of the Mercury program, and Glenn's space flight took four hours and 55 minutes.
太空舱是水星计划的一部分，格伦的太空飞行了4小时55分钟。
Fifty years ago when Alan Shepard climbed inside his Mercury capsule to blast off into space, things were looking pretty grim for the fledgling U.S. space program.
五十年前，当艾伦·谢波德进入墨丘利号太空舱等待发射升空时，所有的一切对于羽翼未丰的美国太空计划都显得十分残酷。
Fifty years ago when Alan Shepard climbed inside his Mercury capsule to blast off into space, things were looking pretty grim for the fledgling U. S. space program.
五十年前，当艾伦·谢波德进入墨丘利号太空舱等待发射升空时，所有的一切对于羽翼未丰的美国太空计划都显得十分残酷。
The results of the two short flights made space officials believe the Mercury program was ready for its first orbital flight.
VOA: special.2009.06.17
I'm Shirley Griffith. Listen again next week to the second part of the story of the Mercury program that took the first American astronauts into space.
VOA: special.2009.06.10
Astronauts in NASA's Mercury Program flew the first American space flights in the early nineteen-sixties.
VOA: special.2011.04.06
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