REXA

例句：

1. 1. The RAF is responsible for the defense of the UK.
   皇家空军负责保卫英国。
2. 2.The RAF has been involved in numerous peacekeeping missions.
   皇家空军参与了多次维和任务。
3. 3. The RAF is a prestigious institution with a rich history.
   皇家空军是一个享有盛誉的机构，有着悠久的历史。