英语翻译At the present time,the oceans are becoming increasingly important as potential sources of fresh water because of recent advances in devising economical and practical desalting processes .The United States government has participated in e

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英语翻译At the present time,the oceans are becoming increasingly important as potential sources of fresh water because of recent advances in devising economical and practical desalting processes .The United States government has participated in e

英语翻译At the present time,the oceans are becoming increasingly important as potential sources of fresh water because of recent advances in devising economical and practical desalting processes .The United States government has participated in e
英语翻译
At the present time,the oceans are becoming increasingly important as potential sources of fresh water because of recent advances in devising economical and practical desalting processes .The United States government has participated in establishing several desalting plants in various parts of the country and at the US Naval Base in Cuba.The city of Key West.Florida now obtains from a large seawater desalting plant the entire supply for the city of over 27 million gallons of pure drinking water per day.
All natural waters even when not polluted by people,are impure since they contain dissolved substances.Rainwater is relatively pure,chief impurities being dust and dissolved gases.After rain falls for a while,the air will have been washed free of dust and bacteria,and any rain that falls the nature of the soil and rocks the water has passes over or through.

英语翻译At the present time,the oceans are becoming increasingly important as potential sources of fresh water because of recent advances in devising economical and practical desalting processes .The United States government has participated in e
目前,由于最近经济的并能够用于实践的海水脱盐工艺项目取得的进展,海水正在变得越来越重要,有希望成为潜在的淡水资源.美国政府参与建立了若干个脱盐工厂,在其国内的多个区域和古巴境内的美国海军基地.西部的关键城市,佛罗里达,现在从一个大的海水脱盐工厂能够获得全部的供水为这个城市每天大概27000000加仑纯的饮用水.
所有的自然界的水源,就算没有被人们所污染,也不是纯净的,而是溶解了多种物质.雨水是相对纯净的,主要的杂质是灰尘和溶解的气体.雨落下来之后,空气就被清洗的没有灰尘和细菌了,雨水落到自然界的土壤和岩石里面,就流走了.

在现在,海水做为新鲜水的潜在来源的价值越来越重要了

henry can't attend the meeting at present at the present at the present 英语翻译用“in the past”和“at present” at present 与 for the present 区别 Treasures at present the person at the present time与at present 的区别 at the present time ,at present ,now的区别` at the present time 和at present一个意思吗 at the moment & now & at present 是什么? 英语翻译全句：Looking back at the past life will be 500 times the present conflict in the present和at present有什么区别 in the present,at the present分别为什么意思?还有：in the present,at present,at the present这三个短语有什么区别?做题时应如何选择呢? at present=at the present time是否成立?还是at present=in the present time?那in the present time呢 at now等于at the moment 等于at present么 英语翻译If the population of the earth goes on increasing at its present rate,there will eventually not be enough resources left to sustain life on the planet.By the middle of the 21st century,if present trends continue,we will have used up all t in the present ,at the present,in the presence,at the presence的区别 at present