High aspect-ratio flying wing configurations usually use split-drag-rudder (SDR) and a set of elevons to fulfill the lateral-directional control, without the traditional vertical tail and rudder.是什么意思_High aspect-ratio flying wing configurations usually use split-drag-rudder (SDR) and a set of elevons to fulfill the lateral-directional control, without the traditional vertical tail and rudder.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句