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  3. [audioFiles]2016m8x/audio_ezfj_ezflisteningd_201607_109[/audioFiles] Skyscra

[audioFiles]2016m8x/audio_ezfj_ezflisteningd_201607_109[/audioFiles] Skyscra

游客2023-11-01  47
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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. / This frame was load-bearing, / meaning that the steel skeleton would support the building’s weight, not its walls. / Before this technology, a taller building required creating thicker stone walls to support its weight. / Thick walls are extremely heavy, / and allow less room for windows and light. /
解析     摩天大楼
   两项新技术的发展使得高楼成为可能。第一项是机械电梯。钢铁建筑技术的发展也促使了更高层建筑的诞生。
   许多专家认为芝加哥的家庭保险大楼是第一座摩天大楼。它高55米，这个高度在当时已经很惊人了。整个建筑使用钢铁框架建造。
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