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| 41. | The "weightless" condition of astronauts in orbit about the earth arises from just this cancellation |
| 在围绕地球运转的轨道中，宇航员的“失重”状态就是惯性力与引力相互抵消的结果。 |
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| 42. | Gagarin marked the first chapter in manned space flights in human history by becoming the first man to orbit |
| 1961年4月12日，苏联宇航员加加林乘坐东方一号航天船绕地球一周，谱写了人类载人航天发展的首页。 |
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| 43. | inhabited capsule with a dog in it, and then in1961 made Cosmonaut Yuri Gagarin the first human to orbit |
| 苏联一路高歌猛进：他们发射了第一艘载人飞船，当时其中搭载的是一只狗，接着于1961年让尤里·加林成为首位进入地球轨道的宇航员。 |
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| 44. | Gagarin marked the first chapter in manned space flights in human history by becoming the first man to orbit |
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| 45. | "As of 2001, nine space stations have been placed in a low Earth orbit and occupied for varying lengths |
| 2001年时,在低地球轨道上安置有九座太空站,运作的时间长短不一。 |
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| 46. | apoapsis in Earth orbit; the point in its orbit where a satellite is at the greatest distance from the |
| 以地球为中心的最远点；人造卫星轨道上离地球中心最远的点。 |
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| 47. | Informative as it was, the LDEF study was conducted in low Earth orbit, well within our planet's protective |
| LDEF的研究固然提供了有用的信息，却是在低轨道实施，位于地球磁场绝佳的保护伞之下。 |
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| 48. | Chaotic attitude motion and its control of a magnetic rigid spacecraft in an arbitrary circular orbit |
| 研究在地球万有引力场和磁场中具有结构内阻尼的磁性刚体航天器在圆轨道上平面天平动的混沌行为及其控制。 |
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| 49. | Once the satellite goes into its orbit round the earth, the panels are unfolded in order to catch the |
| 一旦卫星进入它绕地球运行的轨道，太阳能板就被打开用来吸收阳光。 |
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| 50. | Finally, when in orbit round the earth, the calculators calculate exactly when to fire the retro-rocket |
| 最后，在围绕地球的轨道运行的时候，计算机会精确地计算出应该在什么时候发射制动火箭以重返大气层。 |
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