Heathrow will also offer airlines the option of a third gangway, two on the lower deck and one upstairs, although airlines will have to subsidise that extra themselves.是什么意思_Heathrow will also offer airlines the option of a third gangway, two on the lower deck and one upstairs, although airlines will have to subsidise that extra themselves.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句