回数券 meaning in English

carnet

You can buy coupon tickets at ticket machines and " ticket offices .
这种票叫回数券。
Coupon tickets are useful when you go to the same place many times or take many train rides that require the same fare , since you can get 11 tickets for the price of 10
（回数券（多次乘车票） )多次前往相同的地方或在相同收费的区间多次来往时，可以10次的收费买到11次的车票。