plying

例句：

1. 1.The truck is plying goods from the port to the city.
   卡车正在从港口向城市运送货物。
2. 2. The train is plying between two cities.
   火车正在两个城市之间运行。
3. 3. The ship is plying across the seas.
   船只正在海上航行。