Among them, the issue and management of Airworthiness Directives is just one of the most important works in airworthy management, and our country is still in the primary stage in this aspect.是什么意思_Among them, the issue and management of Airworthiness Directives is just one of the most important works in airworthy management, and our country is still in the primary stage in this aspect.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句