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关于三峡大坝的优点与缺点的英语作文

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The Grand Canyon
Although the Grand Canyon is a mere baby by geological standards, formed only 5
or 6 million years ago, the rock layers at the bottom of the Canyon areThe Grand Canyon is a steep-sided gorge carved by the Colorado River in the
United States state of Arizona. It is largely contained within the Grand Canyon
The Grand Canyon is a steep-sided gorge carved by the Colorado River in the
United States state of Arizona. It is largely contained within the Grand Canyon
2 May 2007 ... The Grand Canyon we visit today is a gift from past generations. Take time to
enjoy this gift. Sit and watch the changing play of light and

As with many dams, there is a debate over costs and benefits. Although there are economic benefits such as flood control, clean hydroelectricity and navigation, there are also concerns about the relocation of people, siltation, loss of archaeological and cultural sites and the impact on regional ecosystem
While the country benefits from gargantuan potential of electricity generation, we have to face up to various environmental conservation issues concerning geological and ecological environment along both river sides and whole upper reaches. The professional designers of the great dam now have to work out a practical way to prevent and remedy pollution effectively, which has already been the focus of world attention.
The Three Gorges Dam project is one of the most controversial international river issues. The dam would cross the Yangtze River, which is a the third largest river in the world, at a point where the river is a mile wide. The 610 foot dam would create a 39 billion cubic meter reservoir that would stretch for 400 miles. 3 Not only is this the largest dam ever built, it is the largest construction undertaking. Financial backing has come from many national and international sources, including United States companies. China has also sought outside engineering and construction consulting from companies including Caterpillar Construction Company.

A dam on the Yangtze River was first proposed by Sun Yatsen in 1919 for power generation purposes. This prosoal never came about because of economic and political strife. Many leaders dreamed of taming the Yangtze River. Life along the Yangtze River can be treacherous because of the deadly flooding known to devastate cities and lives.

Advantages:1、e799bee5baa6e997aee7ad94e59b9ee7ad94361The great amount of water generates huge flow of hydro power.
2、The conservatory formed by the dam facilitates the fishing industry.
3、The dam also provides a best resort for tourism.
4、Serious floods in the lower part of Yangtze River would be regulated. 5、The dam helps clean the pile of sands in river beds in the lower part of the River.
Disadvantages:
1、The dam may be a potential target for foreign military attack.
2、It changes the climate in the upper part of Yangtze River.
3、Ecological conditions in the Yangtze River is greatly changed and many species become hard to survive.
4、Many tourist attractions are buried by the rise of water level.
5、Potential climate changes may cause other weather calamities and geological disasters.

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