Look at the Earth from space. Our planet looks so blue, because water covers nearly three quarters of its surface.
从太空俯瞰地球吧。我们的星球看起来如此蔚蓝，因为水覆盖了其表面近四分之三的面积。
Water is an important part of our body, too. More than half of our total body weight is water. Our body loses water whenever we play sports like football, or go to the toilet. That's why we need to drink plenty of water every day.
水也是我们身体的重要组成部分。我们总体重的一半以上都是水。每当我们进行踢足球等运动或上厕所时，身体就会流失水分。这就是我们每天需要饮用大量水的原因。
We use water to cook, clean, and we then carry waste out of our homes. We use it to take a bath or wash dishes and chopsticks in the kitchen. Farmers use it to grow crops like rice, corn, carrots and tomatoes; factories use it to make products.
我们用水做饭、打扫，然后我们再将垃圾带出家门。我们也用水洗澡或清洗碗筷。农民用水种植水稻、玉米、胡萝卜和西红柿等农作物；工厂用水制造产品。
Since the 1950s, as the population grew, the amount of water that people have used has increased by three times. But the water supply hasn't. Scientists worry that soon there won't be enough water for us, as well as for the animals and plants that share our world.
自 20 世纪 50 年代以来，随着人口的增长，人们的用水量增加了三倍。但供水量却没有增加。科学家们担心，不久之后将没有足够的水供我们使用，与我们共同生活在这个世界上的动植物也面临同样的问题。
What can we do to help?
我们能帮上什么忙呢？
Use water wisely.
明智地用水吧。
Not having enough water isn't a single problem that we need to solve. We also need it to be clean.
缺乏充足的水资源并非我们需要解决的唯一问题。我们还需要水是干净的。
Right now, ships and factories are putting wastes into seas, rivers and so on. Even chemicals that farmers use are running into rivers and lakes. All this pollution can make the water dangerous to drink and cause diseases like cancer. It can also harm fish, whales and other aquatic life.
现在，船舶和工厂正在向海洋、河流等处排放废物。甚至农民使用的化学制品也在流入河流和湖泊。所有这些污染都可能使水源变得不安全，不宜饮用，引发诸如癌症之类的疾病。污染还会危害鱼类、鲸和其他水生生物。
We must do something to stop pollution. It's the best way to protect our world's most valuable natural resource.
我们必须采取措施阻止污染。这是保护我们世界上最宝贵的自然资源的最佳方式。