They hold the high ground, they have high-powered observation equipment and mastery of the air.

他们占据高地，拥有高马力的监测设备以及制空权。

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America's supremacy in the air is made possible by its mastery of space.

美国的空中霸权要归功于其对太空的掌控。

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Based on traditional air-defense efficiency, analyzed air-mastery efficiency evaluation of anti-aircraft unit in campaign of the army.

在分析传统防空作战的基础上，分析了陆军战役防空兵制空效能评估问题。

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It quickly established its mastery of the new media ecosystem with a video hoax that showed designer Marc Ecko spraying graffiti on Air Force One, one of the first instances of viral marketing on YouTube, then only a year old.

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