air force
1.N-COUNT 可数名词空军 An air force is the part of a country's armed forces that is concerned with fighting in the air.
...the United States Air Force...
美国空军
Jack Mann was a Royal Air Force fighter pilot during World War II.
杰克·曼在第二次世界大战时期是英国皇家空军的战斗机飞行员。
