single fare

例句：

1. 1.We need to buy a single fare for the trip.
   我们需要买一张单程票来旅行。
2. 2.The train has only one seat available on this route.
   这列火车在这一路线上只有一张座位可用。
3. 3. The cost of a single fare is $50.
   单程票价为50美元。