air force

air-force的词性：
n.Abbr. AF（名词）缩写 AF

1. The aviation branch of a country's armed forces, such as the U.S. Air Force.
空军：一个国家武装部队的航空分支，如美国空军

2. A unit of the U.S. Air Force larger than a division and smaller than a command.
航空队：美国空军的编制单位，比分队大，比军区小