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KB Term:
Sigma KEE - Valley
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谷
A
Valley
is an area of low-lying land flanked by higher ground. Valleys typically contain a stream or river flowing along the valley floor.
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土地形式
A
LandForm
is the class of geographically and/or geologically distinct areas that occur on Earth's surface, including mountains, hills, plains, valleys, deltas, and features of submerged land areas such as the ocean floor.
低地地區
A
LowlandArea
is a land area lower than the surrounding region, and usually level land.
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Sigma version 3.0 is
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