... river-bed morphometry ==> 河床形态测量 river-bed placer ==> 河床砂矿 river-bed scouring ==> 河床冲刷 ...
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river bed placer 河床砂矿
river r bed placer 河床砂矿
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Then, dispersal gold placer within the intermediate store body was enriched in gravel bed of detention in river bed after many times intermittent elevation, and the gold placer deposit was formed.
当地壳多次间歇性上升后，使砂金中间储存体中分散的砂金集中富集在河床滞留砾石层中，从而形成砂金矿床。
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