With the fast development of the country economy, long-large tunnels are adopted to thrill through hillsides on the construction of montanic railways.
随着国民经济
飞速发展需要，大量山
铁路建设都采用长大隧道方式
过越岭地段。
；山With the fast development of the country economy, long-large tunnels are adopted to thrill through hillsides on the construction of montanic railways.
随着国民经济飞速发展需要，大量山铁路建设都采用长大隧道方式过越岭地段。
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