Group control host is the core of the elevator group control system. It serves as the traffic controller and makes the elevators orderly and efficient.

群控主机是电梯群控系统的核心，它起着交通指挥员的作用，使群控系统中的电梯群有序高效地运行。

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Does having a cockpit display lessen the importance of the air traffic controller?

CNN: Can technology fix the FAA's air traffic troubles?

One of the biggest challenges -- and ironies -- of his dual career is that the football federation's limited coffers mean the air traffic controller has been unable to fly to Europe to watch those expatriate players who have come on board for Cape Verde's continental mission.

CNN: Flying high: Mourinho mentors Cape Verde's 'Special One'

The pilot and air traffic controller discussed options, including landing at Teterboro airport in New Jersey, the official said.

CNN: Pilot praised for 'masterful' landing