溪流
1.turbulent?river/treacherous?rapids激流;
2.creek/brook/stream小溪;?
3.flow/current水流;
4.main?stream干流;
5.tributary/branch支流;
6.upper?reaches/upstream上游;
7.lower?reaches/downstream下游?;
8.confluence汇合处;
9.damke/levee堤坝;
10.canal?运河;
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