water【优秀3篇】-凯发k8游戏

相信大家都知道单词water，但不一定会知道它所包含的汉语意思。的小编精心为您带来了water【优秀3篇】，希望大家可以喜欢并分享出去。

water英语作文 篇1

the provision of safe water necessitates one of the rnajor expenditures of manpower and revenue in our modern cities. the purification of water is basically a two-step or three-step process carried out under the strict supervision of public health scientists and engineers. as the first step, natural water from the least contaminated source is allowed to stand in large reservoirs, where most of the mud, clay, and silt settle out; this is called "sedimentation"。 often in water with high mud content, lime and aluminum sulfate are added to the water in the settling reservoirs. these chemicals react in the water to form aluminum hydroxide, which settles slowly and carries much of the suspended material, including most of carries much of the suspended material, including most of the bacteria, to the bottom of the reservoirs. as the second step, the water is filtered through beds of sand and grovel, which remove other impurities and chemicals in it. during or after filtration, chemicals are ordinarily added to the water to kill any remaining harmful bacteria. chlorine is one of the most common chemicals used for this purpose. a third step taken by some rmnicipalities is adding to the water other beneficial chemicals such as fluoride to make tooth enamel hard, and soda ash to make the water itself soft. the water purification process, carried out with little variation from one large city to another, is perhaps the biggest factor in the prevention of major outbreaks of disease in this country.

water 篇2

water is recognized as the source of life.howeverthis source is in trouble and we are faced with the problem of water pollution.

polluted water carries poisonous chemicals to rivers and seaspoisoning animals and infecting our drinking water.water is mainly polluted by industrial wastes.

for examplewater coming from the paper----making factories will pollute the clean water near the factories.

the quality of water directly influences our healthand water resources are limited on earth.soeffective measures should be taken immediately to secure our life.

水被认为是生命的源泉。然而这种来源是遇到麻烦我们正面临着水污染的问题。

河流和海洋被污染的水携带有毒的化学物质中毒动物和感染我们的饮用水。水是主要由工业废物污染。

例如水是从纸——让工厂将污染了干净的水在工厂附近。

水的质量直接影响我们的健康和地球上的水资源是有限的。因此必须采取有效的措施立即获得我们的生活。

water英语作文 篇3

water is very important to us,we can't live without water.water pollution is a serious problem,it causes our drinking water becomes less 。i think we should protect the water and reuse them,such as don't pour the waste water into the river,remember not to spit into the river and don't throw rubbish into the river and so on.we shoule save water 。 if we do these well,the water will be cleaner.if we don't save water,the last drop of water will be our tear.i really hope the government can do something useful to protect the water.