短语词组短語downwind turn 順風轉彎;二轉彎downwind direction 下風曏downwind slope 背風坡Downwind Commitment 順風承諾downwind distance 順風距離;下風距離downwind district 順風地區downwind position 下風位置downwind gustiness 下風陣性downwind takeoff 順風起飛 返回 downwind