two-rate meter

例句：

1. 1.The two-rate meter is used to measure the speed of a car.
   双费率表用于测量汽车的速度。
2. 2. The two-rate meter was invented by a scientist named Dr. Smith.
   双费率表是由名叫史密斯的科学家发明的。
3. 3. The two-rate meter is an important tool for measuring the speed of a vehicle.
   双费率表是测量车辆速度的重要工具。