节约用水英语作文 he world is not only hungry,but also thirsty for water. This may seem strange to you, since nearly 75 % of the earth's surface is covered with water. But about 97% of this huge amount is sea water, or salt water. Man can only drink and use the other 3% -- the fresh water that comes from rivers, lakes,underground, and other sources. And we cannot even use all of that, because some of it is in the form of icebergs and glaciers. Even worse, some of it has been polluted. However, as things stand today, this small amount of fresh water, which is constantly being replaced by rainfall, is still enough for us. But our need for water is increasing rapidly-- almost day by day. Only if we take steps to deal with this problem now can we avoid a severe worldwide water shortage later on. A limited water supply would have a bad effect on agriculture and industry. Let me give you just one small exampie of how necessary water is to industry. Did you know that to produce a single ton of steel, it takes about 91, 000 liters of water? We all have to learn how to stop wasting our precious water. One of the first steps we should take is to develop ways of reusing it. Experiments have already been done in this field, but only on a small scale. For us, the systems are as important as the spacecraft. 他世界不但仅饿了，也渴了。这对你似乎很奇怪，因为近75%的地球表面被水覆盖着。但约97%的数额巨大的海水，或咸水。人只能喝一杯，用另外3%个--来自河流、湖泊、地下和其他来源的淡水。我们甚至不能使用，因为它的一部分是在冰山和冰川的形成。更糟的是，一些污染已经被污染了。 不过，今天的情况是，这少量的新鲜的水，这是持续被雨水所取代，仍然是不够的我们。但是我们对水的需求正在迅速增加--几乎一天一天。只有我们采取措施来解决这个问题，我们才能避免严重的世界水资源短缺。有限的供水对农业和工业有不利的影响。让我给你一个小的对流换热的水是必要的行业。你知道生产一吨钢材，它需要91，000升的水？ 我们都必须学会如何停止浪费宝贵的水。我们应该采取的第一个步骤就是开发利用它的方法。实验已经完成，在这个领域，但仅在一个小规模。对于我们来说，系统和航天器一样重要。 本文来源：https://www.wddqw.com/doc/e9406a6250ea551810a6f524ccbff121dd36c59b.html