air force
US /ˈer fɔːrs/
UK /ˈer fɔːrs/

1.
空军
the branch of a nation's armed services that conducts military operations in the air
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My brother joined the Air Force after high school.
我哥哥高中毕业后加入了空军。
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The country's Air Force conducted a training exercise.
该国的空军进行了一次训练演习。