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Skyscrapers Skyscrapers were invented in the United States. / As early as the 1880s, two new technical developments made the
Skyscrapers Skyscrapers were invented in the United States. / As early as the 1880s, two new technical developments made the
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2017-05-09
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Skyscrapers Skyscrapers were invented in the United States. / As early as the 1880s, two new technical developments made these taller buildings possible. / One development was the mechanical elevator. / It meant that people would not have to climb many steps to reach the upper floors of tall buildings. / The development of steel building technology also helped make taller buildings possible. / Many experts consider the Home Insurance Building in Chicago to be the first skyscraper. / This tower was about 55 meters tall. / Today this would not be considered much of a skyscraper. / But at the time, this height was striking. / The structure was built using a steel frame. /
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专业英语四级
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