The author takes air traffic networks as new way of managing air traffic, and defines some new concepts, and discusses the policies and mechanism of air traffic networks management.

提出以空中交通网络为主要研究对象的解决空中交通管理的思路，定义了空中交通网络的概念，并对空中交通网络管理的策略和机制进行了探讨。

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As we approach the elephants, he takes out a small plastic squeeze bottle containing fine white ash and puffs some into the air, gauging the breeze.

WSJ: Walk With the Animals