The four stage method and a double gravity model were used to forecast the OD(origin-destination) distribution of air traffic flow in the whole airspace of China.
基于四阶段法，采用双重力模型，预测全国空域的交通流量OD分布。
Features of air traffic management and decision support system are introduced. Then, an improved four-stage standardized modeling method is proposed.
简单介绍了空中交通流量管理和决策支持系统的特点，对一种四阶段规范化数据建模方法加以改进。
The third part is phrasing problem that thesis point, put forward the problem-solving method, from four aspects resolve the present stage wrote essay esse.
第三部分是论文重点，提出解决问题的方法，从四个方面解决现阶段作文中存在的语法问题。
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