现代奇迹 - Season 9 Episode 46
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预告片 | HD | 44:14 分钟 | technology, invention, disaster, construction, machine
One of the most useful machines ever created, the crane is a simple but important combination of the pulley and the lever. Though cranes have been helping us build civilization from at least the time of the Egyptian pyramids, the modern steel-framed construction cranes are a relatively recent development. Put on your work boots as we ride through the history of cranes from ancient days to skyscraper construction sites, ocean-freighter docks, and the International Space Station.
ETC.
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