Uncontrolled airspace is designated Class F, while controlled airspace below 5,490m above sea level and not in the vicinity of an airport is Class E.
无交通管制的空域被定为等级F，而低于海拔5490米、不在机场附近的管制空域是等级 E。
On a clear day, a pilot in controlled airspace can choose a VFR or IFR flight plan, and the FAA regulations were devised in a way which accommodates both VFR and IFR operations in the same airspace.
在晴天，在管制空域内的飞行员可以选择目视飞行规则或者仪表飞行规则的飞行计划，而且联邦航空局的条例是以这样一种方式设计的：在同一空域同时适用目视飞行规则和仪表飞行规则的操作。
Controlled airspace is divided into several different types, designated by letters of the alphabet.
管制空域分为几个不同的类型，类型用字母命名。
In general, from 365m above the ground and higher, the entire country is blanketed by controlled airspace.
一般来说，从地面以上365米的高度，整个国家都被管制空域覆盖。
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.
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。
No one can remember a time before when controlled airspace has been closed in the UK.
没有人能够记得以前英国哪次实行过领空关闭。
In line with international civil aviation policy, no flights are currently permitted in UK-controlled airspace.
根据国际民航政策，英国管制空域目前不允许任何航班飞行。
Existing unmanned weaponized aircraft, like Predator drones that carry Hellfire missiles, are only usable in allied-controlled airspace, BBC notes.
BBC指出，现有的携弹无人驾驶飞机，像装备了“地狱火”（Hellfire）导弹的“掠夺者”（Predator）无人机，只在盟军控制的空域有用。
Ensures the safe and efficient movement of aircraft in controlled airspace and aerodromes by directing aircraft movements. Registration or licensing is required.
空中交通管制员负责在飞行区域内或飞机场，指挥飞行，确保飞机安全有效飞行。需要注册或许可。
Ensures the safe and efficient movement of aircraft in controlled airspace and aerodromes by directing aircraft movements. Registration or licensing is required.
在飞行区域内或飞机场，指挥飞行，确保飞机安全有效飞行，要求有注册或许可证。
CONTROLLED airspace, an airspace of defined dimensions within which air traffic control service is provided to IFR flights and to VFR flights in accordance with the airspace classification.
受管制空域，一个范围明确的空域。在该空域内，仪表飞行规则飞行和目视飞行规则飞行有空中交通管制服务。
The system effectiveness of an air traffic control (ATC) center and its variation directly affect the workload of a controller and the capacity of the airspace controlled by the ATC center.
空中交通管制（ATC）中心系统的效能变化，直接影响到管制员的工作负荷和管制中心所辖空域的交通容量，是ATC系统的关键运行指标。
The system effectiveness of an air traffic control (ATC) center and its variation directly affect the workload of a controller and the capacity of the airspace controlled by the ATC center.
空中交通管制（ATC）中心系统的效能变化，直接影响到管制员的工作负荷和管制中心所辖空域的交通容量，是ATC系统的关键运行指标。
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