实施地面等待是ATFM（空中交通流量管理）中主要采用的一种方法。
The ground-holding is one of the main methods in ATFM (Air Traffic Flow Management).
以前的研究主要集中于宏观模型，讨论交通流量及密度的变化。
In the past, the hot point is the macroscopic model, which discusses the relationships among the traffic stream variables-speed, flow and density.
第二章主要阐述交通流的理论相关知识、当前常用的交通流量预测方法。
In the second chapter, correlative knowledge of the traffic flow theory and current traffic flow forecast methods are introduced.
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