air traffic control
noun [ U, + sing/pl verb ] uk/ˌeə træf.ɪk kənˈtrəʊl/ us/ˌer træf.ɪk kənˈtroʊl/
空中交通管制（人员）；空中交通调度（人员）
the activity of managing aircraft from the ground as they take off, fly, and land, or the people who do this
Air traffic control at Heathrow have given us clearance to land in 20 minutes. 希思罗机场的空中交通调度人员已经准许我们20分钟后降落。