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修建将近50年，青藏铁路到底有多难？为啥当初中国非要这么做？
在建设青藏铁路时，有老外专家说这不可能，但中国非创造奇迹不可！这条铁路中国修建了将近50年，那么青藏铁路到底有多难？为啥当初中国非要这么做？
思远防务君2010/2388
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