“air-traffic area”的概念、定义、翻译、参考文献-科学参考

单词	air-traffic area
释义	air-traffic area [`er ¦traf·ik ´er·ē·ǝ] ^NAVIGATION The airspace within a circular limit defined by a 5-statute-mile (approximately 8-kilometer) horizontal radius from the geographical center of an airport at which an operative airport traffic control tower is located, and an upward extent to 2000 feet (609.6 meters) above the surface.
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