With the fast development of the country economy, long-large tunnels are adopted to thrill through hillsides on the construction of montanic railways.
随着国民经济的飞速发展的需要,大量山区铁路的建设都采用长大式过段。
With the fast development of the country economy, long-large tunnels are adopted to thrill through hillsides on the construction of montanic railways.
随着国民经济的飞速发展的需要,大量山区铁路的建设都采用长大式过段。
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