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| 51. | The engine burns again for about 5 minutes to boost the astronauts out of their low earth orbit and on |
| 引擎再度燃烧大约五分钟，将宇航员从低地球轨道推送到前往月球的路上去。 |
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| 52. | programe belongs to Project Mercury which was run by United States with the goal of putting a man in orbit |
| 这次飞行是美国莫丘里计划中的一个部分，目的是把人类送入地球轨道。 |
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| 53. | If the equivalence principle were violated, the moon's orbit around the Earth would appear skewed, either |
| 如果等效原理遭到违背，月球围绕地球公转的轨道将会出现偏斜——靠近或是远离了太阳。 |
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| 54. | Both clocks aim to measure with99.99997 percent accuracy how much the microgravity of low-earth orbit |
| 这两座钟的目标都是要以99.99997%精确度，去测量低轨道所受的微重力（之于地球表面）使时间变慢多少。 |
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| 55. | The rocket can place about 50,000 pounds into Earth orbit. |
| 这三个串联的推进器总共产生2百万磅推进力。因而该火箭将用来部署5万磅重量的有效载荷到地球轨道中。 |
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| 56. | Launched by a multi-stage Ares5 rocket, the spacecraft will go into orbit around the Earth before docking |
| 使用多级阿瑞斯5型火箭发射，宇宙飞船在与国际空间站对接之前将进入绕地轨道。 |
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| 57. | of rocket-powered flights undertaken by US between 1961 and 1963 with the goal of putting a man in orbit |
| 美国在年与年之间的一项让太空人饶地球轨道飞行的太空计划。 |
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| 58. | is the first air launched solid rocket in America, which is used to place small satellites into low earth |
| 飞马座火箭是美国第1种机载空中发射型固体运载火箭,主要用于将小型卫星送入近地轨道。 |
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| 59. | a circular orbit around the Earth having a period of 24 hours; a satellite in such an orbit will be stationary |
| 一个周期为小时的绕地球的圆形轨道；与地球相对静止的人造卫星的轨道。 |
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| 60. | Shortly after it lifted off in September1992, its booster rocket fired to break out of Earth orbit, and |
| 观察者号于1992年9月升空没多久，推进火箭开动要使它脱离地球轨道时，便暴露出此趟飞航的脆弱性。 |
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