sleepern.睡眠者；枕木；卧铺；爆冷门；耳环sleeper renewal轨枕更新sleeper pincers枕木钳sleeper aeroplane[机] 卧座飞机sleeper fastening轨枕扣件Sleeper structure卧铺结构sleeper occupancy床位占有率sleeper screw bolt枕木螺栓sleeper maintenance轨枕养护sleeper replacement轨枕更换sleeper joint plate枕木接合板,底梁接合板