Cycle water should be fresh and there is no sediment in the tube.
必须确保循环水必须是清洁的，而且管子中没有沉积物。
Density currents generated by saline and fresh water interactions are also important in the transport of sediment in estuaries.
由盐水和淡水相互作用所产生的异重流，在河口泥沙输移中也是很重要的。
Density currents generated by saline and fresh water interactions are also important in the transport of sediment in estuaries.
由盐水和淡水相互作用所产生的异重流，在河口泥沙输移中也是很重要的。
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