本文首先对空中交通流量管理进行了简单的介绍，而后讨论了地面等待策略，最后阐述了几种地面等待模型。
Firstly, the article introduces air traffic flow management simply, then discusses ground-holding policy, Finally the article expounds several ground-holding models.
本文首先对空中交通流量管理进行了简单的介绍，而后讨论了地面等待策略，最后阐述了几种地面等待模型。
Firstly, the article introduces air traffic flow management simply, then discusses ground-holding policy, Finally the article expounds several ground-holding models.
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