| 单词 | thalweg |
| 释义 | thalweg [`täl´veg] GEOGRAPHY The middle of the principal navigable waterway which serves as a boundary between two states. GEOLOGY 1. A line connecting the lowest points along a stream bed or a valley. Also known as valley line. 2. A line crossing all contour lines on a land surface perpendicularly. HYDROLOGY Water seeping through the ground below the surface in the same direction as a surface stream course. |
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