| 11. | Even a telescope in orbit round the earth, like the very successful Hubble telescope, would not be suitable because of the dust particles iron solar system. |
| 即使是一台放置在围绕地球的轨道上的望远镜——如非常成功的哈勃望远镜——也因为太阳系中的尘埃微粒而无法胜任。
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| 12. | Because the Moon has only an eightieth of the Earth's mass, it requires 97 per cent less energy to travel the quarter of a million miles from the Moon to Earth-orbit than the 200 mile-journey from Earth's surface into orbit ! |
| 因为月球的重只有地球的1/8，因此，从月球到地球的25万英里所消耗的能量要比从地球表面进入地球轨道的200英里所耗能量少97%。
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| 13. | Similarly, our own present primitive chemical rockets, though good enough to orbit men, have no chance of transporting us to the nearest other star, four light years away, let alone distances of tens or hundreds of light years. |
| 同样，我们目前使用的原始化学火箭，虽然把人送入轨道，但尚不能把我们送到离我们最近、相距4光年的其他星球上去，更不用说几十光年或几百光年远的地方了。
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| 14. | In recent years a number of communications satellites have been put into orbit . |
| 近些年来, 很多通讯卫星被送上轨道。
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| 15. | orbit in space |
| 在太空中沿轨道运行
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| 16. | inclination of an orbit |
| （天）轨道交角
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| 17. | put a satellite into orbit |
| 将人造卫星送入轨道
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| 18. | orbit a satellite |
| 把人造卫星送入轨道
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| 19. | orbit a star |
| 绕（恒）星运行
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| 20. | go into orbit |
| （美俚）成功；勃然大怒；达到顶点．
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