Navigation dangerous in area around fairway due to floating ice.
由于浮冰，在航道附近航行危险。
Navigation dangerous on area around the North Pole due to pack ice.
由于多积冰，在北极附近水域航行是危险的。
Analysis of River Channel Scour and Silting Evolution and Natural Condition of Navigation Channel in the Guanhe River Estuary Area
灌河河口河道冲淤演变及航道自然条件分析
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