The thalweg in loess hill area is an important terrain structural line, reflecting topography and landform character.
黄土丘陵区沟沿线,是反映该区形征重要形结构线。
The thalweg in loess hill area is an important terrain structural line, reflecting topography and landform character.
黄土丘陵区沟沿线,是反映该区形征重要形结构线。
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