one way fare

例句：

1. 1. The train has a one-way fare of $20.
   火车的单程票价是20美元。
2. 2. Weneed to buy a one-way farefor the trip.
   我们需要买一张去旅行的单程票。
3. 3. The bus has aone-way fare of 5 dollars.
   公交车的单程票价是5美元。