英语词汇“prior permission required”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	prior permission required
释义	prior permission required prior permission required (PPR) An expression used to indicate that permission from the appropriate authority must be obtained before certain aeronautical activities can be carried out. AcronymsSeePPR
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英语词典包含2567994条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。

prior permission required