双程票

例句：

1. 1. We need to buy a round-trip ticket for our trip to Beijing.
   我们需要买一张去北京的往返票。
2. 2. The train has a special feature that allows passengers to purchase round-trip tickets.
   火车有一项特殊功能，允许乘客购买往返票。
3. 3. The airline offers discounted round-trip tickets for travelers during peak seasons.
   航空公司在旺季为旅客提供打折的往返票。