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a fraction of 一小块 As a result, a stream feeding a delta or fan splits into many channels called distributaries point of the bend wind v.绵延，缠绕 One explanation for downstream sorting is that abrasion wears away（磨损） the boulders and cobbles to sand and silt as the sediment moves downstream over the years deposit noun (1）押金，存款 （2）沉淀物 verb.存入 |
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