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Use "river-bed" in a sentence
"I can rest up and look over my notes while you're hunting your ancient river-bed."
"Near by was the smoke-blackened ruin of the farm-house, fired by the Russians when they retreated from the river-bed."
"They were originally painted in bright colors, but even now, in their light brown clay (unique in China, taken from a river-bed) they seem alive, monumental and powerful."