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  3. [audioFiles]2017m5s/audio_ezfj_109_201705[/audioFiles] Skyscrapers Skysc

[audioFiles]2017m5s/audio_ezfj_109_201705[/audioFiles] Skyscrapers Skysc

游客2023-10-30  44
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答案     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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