短语词组短语downwind turn 顺风转弯;二转弯downwind direction 下风向downwind slope 背风坡Downwind Commitment 顺风承诺downwind distance 顺风距离;下风距离downwind district 顺风地区downwind position 下风位置downwind gustiness 下风阵性downwind takeoff 顺风起飞 返回 downwind