请将下列段落翻译成汉语：Air traffic control (ATC) is a service provided by ground-based controllers who direct aircraft on the ground and in the air. The primary purpose of ATC systems worldwide is to separate aircraft to prevent collisions, to organize and expedite the flow of traffic, and to provide information and other support for pilots when able.
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- From the control tower, air traffic controllers coordinate aircraft movement both _____________ and on the ground.
- 4. From the control tower, air traffic controllers coordinate aircraft movement both ________ and on the ground. A: on the air B: in the air C: at the air D: of the air
- 词汇与结构 When aircraft are under radar control, air traffic controllers may replace some or all of these phases of the approach with radar____.
- Air traffic control provides traffic ______ services to the aircraft on a time permitting basis.
- satelliteautomatevaporin the air expansionhazardincorporate take control of lucrativemagneticget/be stuck inmountsignal bunchvibrateapproximatelycalculateapartcorrelate frequency From the control tower, air traffic controllers coordinate aircraft movement both ____ and on the ground.