On the train, we might notice driver, ______________, conductor, train inspector, broadcaster, train police officer and train cleaning staff . 在火车上，我们可能会注意到司机，______________，售票员，火车检查员，广播员，火车警察和火车清洁人员。
A、chief conductor 列车长
B、operation director 运行主任
C、Ticket inspectors 检票员