| unit 1 introduction part 1 history part 2 definition part 3 classification part 4 development of high-speed rail in china unit 2 ticket service part 1 book the tickets part 2 buy the tickets part 3 refund the tickets part 4 check the tickets unit 3 station service part 1 directing and waiting part 2 left luggage part 3 station announcement unit 4 on-train service |
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