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当我第一次看到海的时候，还很小，浩瀚的大海使我惊叹，我心中自然而然地生出一个概念：水是源源不断的，是取之不尽，用之不竭的。 When I saw the sea for the first time, it was still very small, and the vast sea amazed me. Naturally, a concept came into being in my mind: water is endless, inexhaustible and inexhaustible. 的确，在人们的印象中，水无处不在，为人们的生产、生活服务。它是工业的血液，农业的命根子，生活中最不可缺少的小助手……总之，水是我们赖以生存的宝贵财富，而且据调查，我们居住的地球还有一个别名叫“水球”，顾名思义，我们的地球上70.8%充满了水。但这么多水，其中海水就占了97％，陆地上的地面水占0.017%，其中又有一半在内海和盐湖之中。淡水的根本来源是雨露，每49年落到陆地上的水只有10.5万立方米，而这其中的2/3又被植物蒸腾或地面蒸发掉，只有1/3，即3.75万立方米的水可供人类利用。 Indeed, in people's impression, water is everywhere, serving people's production and life. It is the blood of industry, the lifeblood of agriculture, the most indispensable little assistant in life In a word, water is the precious wealth we depend on for survival. According to the survey, there is also a person named "water ball" living on the earth. As the name suggests, 70.8% of our earth is full of water. But with so much water, 97% of it is sea water, 0.017% is surface water on land, and half of it is in inland sea and salt lake. The basic source of fresh water is rain and dew. Only 105000 cubic meters of water falls on the land every 49 years, and 2 / 3 of it is evaporated by plant transpiration or ground evaporation. Only 1 / 3, or 37500 cubic meters of water can be used by human beings. | 
