激流turbulent river/treacherous rapids;
小溪creek/brook/stream;
水流flow/current;
干流main stream;
支流tributary/branch;
上游upper reaches/upstream;
下游lower reaches/downstream;
汇合处confluence;
堤坝dam/dyke/levee;
疏浚河道dredge a channel;
运河canal
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2016-02-29
2016-02-29
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2016-02-29