八年级上册英语作文,假如我是一名导游,

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  • The Dujiangyan Dam,45km north of Chengdu,is an ancient technological wonder of

    the country.More than 2000 yers ago,Li Bing(250-200BC),as a local governor of

    the Shu State,designed this water control and irrigation dam and organized

    thousands of local people to complete the project to check the Mingjiang

    River.For many years the river,flooded the Chengdu agricultural area and local

    farmers suffered a lot from the water disaster.Due to the success of the

    project,the dam automatically diverts the Mingjiang River and channels it into

    irrigation canals.For many years the dam has continued to make the most of the

    water conservancy works.

    Expansion has been undertaken since 1949 and at present the system does a

    good job of irrigating farming land across 33counties of the western part of

    Sichuan Province.Local people feel proud of the system becaude it has supported

    a large amount of people in their daily life.

    What makes this system so good?

    The system is a large hydraulic water project which consists of three main

    parts:the Fish Mouth Water-Dividing Dam,the Flying Sand Fence,and the

    Bottle-Neck Channel.

    The Fish mouth functions to divide the flow of water into an inner river

    and an outer river.Long ago,when Li Bing worked as the local governor of the

    Shu State,he found the old river canal was too narrow to hold much water,which

    often overflowed the banks and caused disastrous flood.Based on natural

    geographic conditions,he organized the people to build a man-made dam.The

    whole dam looks like a fish,and the front dam has a circular cone shaped like a

    fish mouth.It is the dam that channels water into an outer canal and an inner

    canal.The outer water canal functions as the main stream and holds sixty

    percent of water in the river.The extra water goes through the inner canal for

    irrigation in Chengdu areas.

    The Flying Sand Fence joins the inner and outer canals.The fence functions

    to controll the flow of water and discharge excess into the inner canal from the

    main stream.During the dry season the fence doesn‘t work much,but when floods

    occur,the river rushes forward along the outer canal.As it approaches the

    fence,the fence,the river begins to turn round fast and soon many whirlpools

    are formed.The volatile whirlpools sweep away sand and pebbles and,throw them

    into the outer canal.For many years huge bamboo baskets were used as the fence.

    They were filled with stones and pebbles.However,at present,reinforced

    concrete weir has replaced the ancient fence.

    So now,let‘s discuss the Bottle-Neck Channel.A trunk canal was cut

    through the mountain into two parts which link up the inner canal for

    irrigation.The small part is later called Li Dui,which means an isolated hill.

    Chengdu looks like a large bottle and the trunk canal between the mountain and

    the hill takes shape of the bottleneck.The trunk canal technically has two

    functions:First,it leads the water to irrigate the farming land in western

    Sichujan; Secondly,the trunk casnal works together with the Flying Sand Weir to

    keep the flow below a certain point in the inner canal during flood season.Some

    stone tablets,which stand on the isolated hill,are engraved in Buddhist

    Sanskrit.The local people hope that the Buddhist tablets can exert the Buddhist

    superpower to harness flood disaster.For over two thousand years,in fact,the

    Fish Mouth Water-Dividing Dam,the Flying Sand Weir,and the Bottle-neck Channel

    automatically work together to control foods and sweep away sand and stones in

    the main stram.The local people benefit a lot from this project.