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Ocean current exerts a great influence on ship navigation and sailing safety.
海流对船舶导航、航行安全影响较大。
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The ship navigation system consists of mathematical model and knowledge model.
船舶驾驶系统既包含数学模型，也包含知识模型。
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The ship navigation system consists of mathematical model and knowledge model.
船舶驾驶系统既包含数学模型，也包含知识模型。
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