| 1. | Why then should objects stay with the earth ?
为什么物体会呆在地球上呢？ |
| 2. | What kind of spectacle would its hidden hemisphere present ?
在地球上看不见的那一面到底是什么模样？ |
| 3. | I gather there must be an extremely great amount of water on the earth .
我想在地球上必然有极其大量的水。 |
| 4. | Matter in this state has never been found or prepared on earth .
这种状态下的物质在地球上从未发现过或制备过。 |
| 5. | The dark vault surrounded the terrestrial globe as if to crush it .
阴森森的天空罩在地球上，好象要把它压扁似的。 |
| 6. | It will arrive at the earth with less frequency than a brother photon emitted on the earth .
它到达地球时的频率小于在地球上发射的同种光子的频率。 |
| 7. | Without such systems the lunar explorers would still be spinning in simulators on earth .
如没有此种系统，月球探险者至今仍在地球上的模拟器中旋转。 |
| 8. | Our older mountain ranges are gradually being worn away and their mass redistributed over the earth .
古老的山脉正在逐渐磨损，其质量重新分布在地球上。 |
| 9. | Now man not only littered the earth, but also has left a number of metal products on the moon .
现在人类不仅在地球上乱扔东西，而且在月球上也留下一些金属制品。 |
| 10. | At the low temperatures prevailing on the earth, most of the elements have combined to form compounds .
在地球上通常为低温的情况下，大多数元素已结合成化合物。 |
