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| 31. | periapsis in Earth orbit; the point in its orbit where a satellite is nearest to the Earth. |
| 以地球为中心的最近点；人造卫星轨道上离地球中心最近的点。 |
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| 32. | to travel the quarter of a million miles from the Moon to Earth-orbit, |
| 因此，从月球到地球的25万英里所消耗的能量， |
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| 33. | The two satellites were placed respectively in LEO (low earth orbit) and geostationary transfer orbit |
| 两颗卫星分别进入近地轨道和地球同步转移轨道。 |
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| 34. | The secretary of defense ordered the army to put a satellite into Earth orbit as soon as possible. |
| 国防部长命令军方尽快将一颗人造卫星送入地球轨道。 |
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| 35. | In recent years a number of communications satellites have been put into orbit around the earth. |
| 近年来大量的通讯卫星被送入环绕地球的轨道. |
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| 36. | Still others would stand as sentinels in high earth orbit to spot dangerous intruders from our star. |
| 还有一些将作为地球高轨上的哨兵来确定危险入侵者距离我们这个星球的准确位置。 |
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| 37. | Launch vehicle: Rocket system that Boosts a spacecraft into Earth orbit or Beyond Earth's gravitational |
| 运载火箭:将航天器推入绕地球轨道或脱离地球引力范围的火箭系统。 |
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| 38. | Chaotic attitude motion of a magnetic rigid spacecraft in a circular orbit of the earth is treated. |
| 研究在地球万有引力场和磁场中的磁性刚体航天器在圆轨道上的混沌姿态运动。 |
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| 39. | space agency NASA first used the word shuttle in nineteen-sixty-eight to describe a craft that would orbit |
| 美国太空总署NASA在1968年第一次把这种能绕地球的轨道运行并能把宇航员送回的航空器用“太空梭”一词来描述。 |
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| 40. | A killer satellite is one which can home in on other objects in earth orbit and destroy them. |
| 杀伤卫星能追踪其他在地球轨道上飞行的物体并将其摧毁。 |
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