论文部分内容阅读
人的生存离不开水。是的,水是万物之源,它由地下到天空,从陆地到海洋,从冰川到草原,周而复始地循环着,滋润、哺育着人类万物。据科学家测定,人体约60％的重量是水分,儿童体内水分更多,可占体重的75％,可见水对人的生命多么重要。现在全球的水面大约有138亿平方千米,覆盖着3/4的地球表面,但这些水资源中97.3％是又咸又苦的海水,淡水少得可怜,
Human survival can not be separated from water. Yes, water is the source of all things. It flows from the earth to the sky, from land to the sea, from the glaciers to the grasslands, and it circulates cyclically, moisturizing and nurturing all human beings. According to scientists, about 60% of the body’s weight is moisture, and children’s body has more water and can account for 75% of body weight. It can be seen how important water is to human life. The current global water surface is about 13.8 billion square kilometers, covering 3/4 of the earth’s surface. However, 97.3% of these water resources are salty and bitter, and the fresh water is pitifully low.