The largest of these government agencies is the Civil Aeronautics Board (CAB) of the United States. Its function is to regulate and promote transportation within the country and between the United States and other countries.是什么意思_The largest of these government agencies is the Civil Aeronautics Board (CAB) of the United States. Its function is to regulate and promote transportation within the country and between the United States and other countries.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句