1. "Peace on earth begins at home."
    "人间平安，始于家庭。"

2. And upsetting the natural water cycle (循环) on Earth makes significant problems for its inhabitants.
    扰乱地球上水的自然循环会对它的居民造成严重问题。

3. Although scientists still cannot predict earthquakes, they are learning a great deal about how the large plates in the earth's crust move, the stresses between plates, how earthquakes work, and the general probability that a given place will have an
    尽管科学家们仍无法预测地震，但对地壳中的大板块如何移动，板块间的压力如何，地震如何发生，某地区发生地震的一般概率为多少，他们正了解得越来越多。

4. After another 200 million years, dinosaurs and the first mammals walked the Earth.
    又过了2亿年，恐龙和第一只哺乳动物开始在地球上行走。

5. About three million years ago, scientists believe, the first human beings walked the Earth.
    科学家们认为，大约300万年前，原始人类开始在地球上行走。

6. As the number of people on Earth increases, it becomes increasingly difficult for the population to survive on the resources of the land.
    随着地球上人口的增加，人类依靠土地资源生存变得越来越困难。

7. As an outcome of their hunger for empires, the Earth was abused.
    他们渴望成为帝国的贪欲造成了地球资源被滥用的恶果。

8. Yes, the earth's resources are not infinite; natural areas are being destroyed; the number of plant and animal species is declining; consumption of resources is expanding.
    是的，地球的资源不是无限的，自然界在遭受破坏，动植物的物种数目在减少，而资源的消耗却在增加。

9. Since the sea covers the greater part of the earth´s surface,
    既然海洋覆盖着地球的大部分表面，

10. Some of them have planets like our earth travelling round them.
    有些恒星带有行星。这些行星像地球一样绕着恒星旋转。