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lance, also decides, an area of the water resources. Water evaporation is one of the most important functions of. Produced by evaporation of water into the air and over atmosphericactivities and sports. Atmospheric water vapor mainly es from the ocean, part of that is from the mainland surface evaporation. Water vapor in theatmosphere of the cycle is evaporation condensation precipitation and the cyclical of evaporation process. Ocean water vapor above can be transported to the land above water vapor condensation precipitation, called externalprecipitation, Direct condensation of water over the mainland, says its steam rainfall precipitation.其中前幾句可有可無 不想寫的話能夠不寫中文:水循環(huán)是多環(huán)節(jié)的自然過程,全球性的水循環(huán)涉及蒸發(fā)、大氣水分輸送、地表水和地下水循環(huán)以及多種方式的水量貯蓄。 降水、蒸發(fā)和徑流是水循環(huán)過程的三個(gè)最主要環(huán)節(jié),這三者構(gòu)成的水循環(huán)途徑?jīng)Q定著全球的水量平衡,也決定著一個(gè)地區(qū)的水資源總量。蒸發(fā)是水循環(huán)中最重要的環(huán)節(jié)之一。由蒸發(fā)產(chǎn)生的水汽進(jìn)入大氣并隨大氣活動(dòng)而運(yùn)動(dòng)。大氣中的水汽主要來自海洋,一部分還來自大陸外表的蒸散發(fā)。大氣層中水汽的循環(huán)是蒸發(fā)-凝聚降水蒸發(fā)的循環(huán)往復(fù)的過程。海洋上空的水汽可被輸送到陸地上空凝聚降水,稱為外來水汽降水;大陸上空的水汽直截了當(dāng)凝聚降水,稱內(nèi)部水汽降水。二、It is generally believed that there is a good supply of fresh water. But to our disappointment, the fact is just the opposite.As we can see, the world population is growing rapidly day by day. So enough fresh water is needed to feed such a big population. What’s more, with thedevelopment of industry, factories and vehicles produce poisonous gases or wastes, which consequently results in the pollution of water. Though