1. Earth looks like a big blue marble (玻璃球); from high above the Earth and from the moon, the planet gleams and shines.
    地球看上去就像一个巨大的蓝色玻璃球, 从高高的地球上空或从月球上望去，这颗行星熠熠生辉，闪闪发光。

2. But how would we find such a planet?
    但是，我们如何才能找到这样一颗行星呢?

3. Because of water, Earth is a living planet.
    因为有水，地球才成了一个有生命的行星；

4. Whether a planet can support life depends on the size and brightness of its star, that is its ´sun´.
    一颗行星是否能够维持生命取决于它的恒星--即它的"太阳"--的大小和亮度。

5. 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。

6. Water gives life to our planet.
    水给我们的星球带来了生命。

7. With fewer trees, the paper industry is producing more paper from recycled materials but, unfortunately, damages the planet.
    由于树木减少，造纸厂更多地依靠再生材料造纸，但不幸的是，这同时也对我们这个星球带来了损害，

8. The first question to answer is whether a planet can actually support life.
    第一个需要解答的问题是一颗行星是否有能够维持生命的条件。

9. 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。

10. The population explosion on our planet has been increasing at an alarming rate but the percentage of increase is decreasing.
    我们星球上的人口爆炸状况正在以惊人的速度加剧着，不过增长的百分比在减小。