1 N-UNCOUNT [oft NOUN n] 空中交通管制 Air traffic control is the activity of organizing the routes that aircraft should follow, and telling pilots by radio which routes they should take. 空中交通管制
2 N-UNCOUNT-COLL [with singular or plural verb] 空中交通管制人员 Air traffic control is the group of people who organize the routes aircraft take. 空中交通管制人员