gear-down light起落架入下信号灯
gear-down glide放起落架下滑
gear-down roll起落架放下的横滚
gear compound down换低挡
gear-down放起落架飞行速率
gear door down line起落架门打开管路
gear-down configuration起落架下的形态
gear-down speed放起落架飞行速度
gear-down aircraft起落架放下的飞机
V（动词） to adapt to a new situation by decreasing output, intensity of operations, etc 降低(输出、操作强度等)以适应新环境