The CAD has maintained close liaison with the civil aviation authorities of the Mainland and Macau in relation to the development of flight procedures and ATC co-ordination arrangements.是什么意思_The CAD has maintained close liaison with the civil aviation authorities of the Mainland and Macau in relation to the development of flight procedures and ATC co-ordination arrangements.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句