... river-bed deformation ==> 河床变形 river-bed evolution ==> 河床变迁 river-bed morphometry ==> 河床形态测量 ...
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一层层各种各样的岩石铺叠着一直深入到峡谷之中,直至地层,追逐着时光的变迁,在河床中显露着一些地球上最古老的岩石。
Layer upon layer of different rocks recede down into the Grand Canyon and back through time, until the strata, at the river, revealed some of the oldest exposed rocks on earth.
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