elevators电梯elevatorn.<美>电梯；飞机升降舵；斗式皮带输送机elevator car safety电梯安全装置elevator split ring升降机开口环elevator car buffer梯厢减振器elevator-platform[化] 升降台elevator hay loader升运器式装干草机elevator shaft bush升降机轴衬Elevator door system电梯门机elevator type loader升运式装载机elevator part design电梯部件设计elevator sheave beam电梯设备钢梁