空中禁区;
As one kind of finite nature resource being shared by human, radio frequency spectrum have the three-dimensional characteristic of the extensity, timeliness and frequency, but it is not be restricted with terrain, airspace and time.
无线电频谱作为一种人类共享的有限自然资源,具有空间、时间和频率的三维特性,又不受地域、空域、时域的限制。
But as NPR's David Schaper explains that restricted airspace is not with the Malaysia Airlines' Boeing 777 went down.
但是据NPR新闻的大卫·沙佩尔报道,该管制空域并不是马航波音777飞机坠毁的区域。
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