Nowadays, in mountain railroad engineering survey, the efficiency of traditional leveling method is low, is very difficult to practice because of terrain undulation being big.
目前在山区铁路工程测量过程中，由于地形起伏较大，传统的水准测量效率低，非常难以实施。
Nowadays, in mountain railroad engineering survey, the efficiency of traditional leveling method is low, is very difficult to practice because of terrain undulation being big.
目前在山区铁路工程测量过程中，由于地形起伏较大，传统的水准测量效率低，非常难以实施。
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