tractor semitrailer

例句：

1. 1. The tractor is used for pulling heavy loads.
   这台拖拉机用于拉动重物。
2. 2.The farmer needs a tractor to work the fields.
   这位农民需要一台拖拉机来耕作田地。
3. 3. The tractor has four wheels, which makes it easier to move around.
   这台拖拉机有四个轮子，这使得它更容易移动。