词汇	backward call indicators
释义	backward call indicators 反向唿叫指示元
随便看	train diagram for doubletrack train diagram for singletrack train diagram in pairs train diagram not in pairs train diagram plotter train direction train direction indicator train direction register circuit train disinfecting siding train dispatch train dispatch data train dispatcher train dispatcher rs office train dispatchers Train Dispatching train dispatching command train dispatching controlling train dispatching model train dispatching radiophone train dispatching section train dispatching section,train control section train dispatching telephone train dispatching telephone system train display train division projects