Because of complex landform and big difference of elevation, transmission line in mountain area has its characteristics which are different form transmission line in common landform.
山区送电线路因其地形复杂、相对高差大，在许多方面都具有不同于普通地形送电线路的特点，对设计工作和勘测工作有更高的要求。
The thalweg in loess hill area is an important terrain structural line, reflecting topography and landform character.
黄土丘陵区的沟沿线，是反映该区地形地貌特征的重要的地形结构线。
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