Down-Lock下位锁
down lock operating rod下位锁操纵杆
down lock spring下锁弹簧
down lock linkage下位锁连杆
DNLK Down Lock放下锁
lock down船过闸向下游驶去
lock down agreement坚守协议
Lock down universal wheels向下锁住万向轮
lock down the building封锁大楼