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求人工翻译一小段英文,谢谢.

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求人工翻译一小段英文,谢谢.
Hoover Dam, formerly called Boulder
Dam, dam in Black Canyon on the Colorado River, at the Arizona-Nevada border,
U.S. Constructed between 1930 and 1936, it is the highest concrete arch dam
in the United States. It impounds Lake Mead, which extends for 115 miles (185 km) upstream and is one of the
largest manmade lakes in the world. The dam is used for flood and silt control,
electric power, agricultural irrigation, and domestic water supply. It is also a major sightseeing
destination, with almost one million visitors per year going on tours through
the dam.
Hoover Dam is 726 feet (221metres)
high and 1,244 feet (379metres) long at the crest. It contains 4,400,000 cubic
yards (3,360,000 cubic metres) of concrete. Four reinforced-concrete
intake towers located above the dam divert water from the reservoir into huge
steel pipes called penstocks. The water, after falling some 500 feet (150metres)
through the pipes to a hydroelectric power plant in the base of the
dam, turns 17 Francis-type vertical hydraulic turbines,
which rotate a series of electric generators that have a total power
capacity of 2,080 megawatts. More than half of the generated electric power goes to the Metropolitan Water
District of Southern California, the city of Los Angeles,
and other destinations in southern California;
the rest goes to Nevada and Arizona. The dam, power plant, and reservoir are owned and
managed by the U.S. Department of the Interior’s Bureau of Reclamation.
Hoover Dam is named in honour of Herbert Hoover, the U.S. president during whose
administration (1929–33) construction began on the dam and whose work as
commerce secretary in the 1920s secured agreements necessary for the project to
proceed. Although legislation passed by Congress in 1931 officially named the
dam for Hoover,
officials in the succeeding administrations of Franklin D. Roosevelt and Harry S. Truman referred to it as Boulder Dam,
its name during the planning stages before construction. In 1947 Truman signed
a congressional resolution restoring the structure’s formal name to official
use.
From the time of the dam’s
construction, a federal highway traversed the dam’s crest, serving both
visitors to the dam and travelers between Nevada
and Arizona.
As the dam and surrounding Lake Mead recreation
area rose in popularity, traffic increased, and the problem became especially
severe under security restrictions imposed after the attacks of Sept. 11, 2001. Construction
began on a long-planned Hoover Dam Bypass Project, and
in October 2010 a
concrete arch bridge with a 1,060-foot (322-metre)
span—the longest in North America for that type of bridge—opened
for through traffic within view of Hoover Dam. The old road along the crest isreserved for use by visitors to the dam.
胡佛大坝,以前称为大石水坝.水坝位于在亚利桑那-内华达州边界,科罗拉多河的黑峡谷处,由美国建于1930-1936,是美国最高的混凝土拱坝.它阻挡了世界上最大的人造湖之一,上游延伸115英里(185公里)的米德湖.大坝用于防洪和淤泥控制,电力,农业灌溉与生活用水的供给,同时也是一个重要的观光目的地.每年几乎有一百万游客去参观水坝.
  胡佛大坝高726英尺(221米)长1244英尺(379米).它包含44个00000立方英码(3360000立方米)的混凝土.四个钢筋混凝土进水塔位于坝上,把水从水库抽到巨大的压力钢管.水下降500英尺(150米)通过管道到水坝底部的水力发电厂,通过17个混流型垂直液压涡轮机,旋转总功率2080兆瓦容量的电动发电机.一半以上的所产生的电能,供应南加利福尼亚供水区,如洛杉矶等,其余供应内华达州和亚利桑那州.大坝和水库,发电厂由美国内政部农垦局拥有并管理.
  胡佛大坝命名是为纪念赫伯特·胡佛.其在担任美国总统期间(1929–33)开始建造大坝的工作以及其在担任商务秘书(1920年间)确保项目的成功通过.虽然国会在1931年通过决议正式命名
  大坝为胡佛大坝,但随后的罗斯福总统和杜鲁门总统规划阶段施工前仍称其为大石坝.1947年杜鲁门签署国会决议确定大坝名字的官方使用.
  从大坝建造开始,联邦公路横穿大坝的坝顶,同时服务大坝的游客和和内华达州与亚利桑那州的游客.
  随着坝和周围的米德湖娱乐区域人气上升与流量增加,在911事件后安全问题变得特别严重.一个计划已久的大坝绕道工程开始建设.2010年10月一座美国北部最长的,跨度1060英尺(322米)开始投入交通运营,在其上可以欣赏胡佛大坝的景色.同时,旧的通过坝顶的道路也被保留供游客参观大坝.

  翻得累死,这么多专业词汇.