为什么像进近，塔台，地面这种频率在某些机场没有分开为几个个频率？
Why aren't the frequencies like approach, tower, and ground separated on some airports?
如果随后的实验证实了该系统的优势，那么当乘客在某些机场转悠时，可能很快就在眼前浮现出意想不到的幻灯片秀。
If further tests confirm its advantages, travellers in some airports may soon find themselves looking at unexpected slide-shows when they visit the airport.
在某些区域（主要是机场附近），受管制的空域一直延伸到距地面215米之上，而且在紧邻机场的区域，控制区域一直延伸到地表。
In certain areas, mainly near airports, controlled airspace extends down to 215m above the ground, and, in the immediate vicinity of an airport, all the way down to the surface.
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