1. When the north pole is towards the sun, the sun´s rays shine down quite straight on the northern part of the earth, while they slant down towards the southern part.
    北极斜向太阳时，阳光直射在北半球，斜射在南半球。

2. Without the air to stop some of the sun´s heat, every part of the earth would be burning hot when the sun´s rays strike it.
    假如没有空气吸收太阳的一些热量，地球在阳光照射下就会灼热不堪。

3. Without the air to hold some of the sun´s heat, the earth would be freezing cold at night, too cold for us to live. 2
    如果没有空气储存大部分太阳热量，地球在夜晚就会冻得冰冷，人们便无法生存。

4. We can see it only when the sun is shining on it, or when sunlight is reflected on to it from the earth.
    只有在阳光照射到月亮上或阳光从地球折射到月亮上时，我们才能看到月亮。

5. Well, to meet this difficulty, I resolved to dig into the surface of the earth, so as to make it easier to launch the boat.
    好吧，为了克服这一困难，我决定把地面挖平。这样可以使小船下水时容易一些，

6. Well, I measured the distance of ground, and calculated how deep it was to be dug, how broad, and how the earth to be thrown out.
    接着，我测量了一下距离，计算了一下该挖多深、多宽，以及怎样把土运走。

7. We must learn to live in balance with nature, or our shining planet Earth will die.
    我们必须学会与大自然和谐相处。不然的话, 我们这个熠熠生辉的星球就会死亡。

8. Water is the source of this beauty and the source of life on Earth.
    水是地球上的美丽之源、生命之源。

9. We mothers are, each of us, the only person on earth who has quite such an all-consuming interest in our child.
    普天之下做母亲的，无一不是为自己的孩子呕心沥血的。

10. With the combination of intelligence and manual skill (allowing us to make and use tools), people have found ways to use plant and animal resources, mineral ores, fuels, and many other of Earth's materials and resources.
    由于智力与手工技能的结合（使得人类能够制造和使用工具），人们已经发现了诸多利用地球动植物资源、矿产资源、燃料和许多其他物产和资源的方法。