| 11. | The life forms most likely to develop on a planet would be bacteria. |
| 行星上最容易生存下来的是细菌。
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| 12. | For most of the earth's history they have been the only form of life on our planet . |
| 在地球上发展的大部分进程中，细菌是地球上唯一的生命形式。
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| 13. | If we were able to discover lowly forms of life like bacteria on another planet , it would completely change our view of ourselves. |
| 如果我们能够在另一颗行星上找到诸如细菌的那种低等生命，那么这个发现将彻底改变我们对我们自己的看法。
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| 14. | It is a world of red sandy deserts ( hence its name -- the Red Planet ), cloudless skies, savage sandstorms, chasms wider than the Grand Canyon and at least one mountain more than twice as tall as Everest. |
| 这是一个红色沙漠的世界（因而得名：红色行星），无云的天空，凶猛的沙暴，比大峡谷还宽的裂缝，起码有一座山有珠穆朗玛峰的近两倍高。
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| 15. | We must conclude from the work of those who have studied the origin of life, that given a planet only approximately like our own, life is almost certain to start. |
| 根据研究生命起源的人们所作的工作，我们必然会得出这样的结论：如果设想有一颗行星和我们地球的情况基本相似，那几乎肯定会产生生命。
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| 16. | First of all, they may have come to this planet of ours thousands or millions of years ago, and found our then prevailing primitive state completely uninteresting to their own advanced knowledge. |
| 首先，他们可能在几千年前或几百年前已来过我们地球，并且发现我们地球汉时普遍存在着的原始状态同他们的先进的知识相比是索然无味的。
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| 17. | Environmental experts point out that increasing pollution not only causes serious problems such as global warming but also could threaten to end human life on our planet . |
| 环境学家指出：持续增加的污染不仅会导致像全球变暖这样严重的问题，而且还将威胁到人类在这个星球的生存。
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| 18. | The planet Jupiter has nine moons. |
| 木星有9个卫星.。
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| 19. | The night on the planet Mars must be intensely cold, owing to the thinness of the air. |
| 由于空气稀薄，火星上的夜晚一定极为寒冷。
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| 20. | a strange being from another planet |
| 来自其他星球的奇异生物
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