mileage open to traffic

例句：

1. 1. The car has a mileage of 200 kilometers.
   这辆车的里程是200公里。
2. 2.The driver needs to maintain the car's mileage regularly.
   司机需要定期维护汽车的里程。
3. 3. The new model car hasa mileage of 50 milesper gallon.
   这款新型汽车每加仑行驶50英里。