road tractor

例句：

1. 1. The farmer needs a new road tractor to help with the heavy work.
   农民需要一辆新的拖拉机来帮助完成繁重的工作。
2. 2. The tractor is used for pulling carts and transporting goods on the farm.
   拖拉机用于拉动马车和在农场运输货物。
3. 3. The tractor has four wheels and can move at high speeds.
   拖拉机有四个轮子，可以高速移动。