短語詞組短語air traffic clearance 飛航許可;航空交通批準(zhǔn)證adc air defence clearance 防空許可Air Cargo Clearance System 空運貨物清關(guān)系統(tǒng)air valve clearance 氣門間隙air door clearance 氣門間隙air gap clearance 空氣間隙;氣隙長度addcty air defence clearance 防空許可air r clearance 空隙nippon air cargo clearance system 日本航空貨物通關(guān)資料處理制度 返回 air clearance