These channels are most common near the apex of the alluvial fan body. 這些河道最常見(jiàn)于近沖積扇體的頂端。
The landform on which ancient human activity relic located was interfluvial floodplain on Yongding River Alluvial Fan. 古人類(lèi)活動(dòng)遺址所處地貌部位為古永定河沖積扇的河間沖積平原。
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