Usually, so-called Marine traffic investigation is traffic observation.

通常所说的海上交通调查主要指交通观测。

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Through investigation on the practical situations of marine traffic at Ningbo port, predictions on marine accidents are made.

通过对宁波港海上交通实况调查，分析了宁波港海上搜救需求的特点，并对港口海事用多种方法进行了预测。

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