steam tractor

例句：

1. 1. The steam tractor is used for agricultural work in the countryside.
   蒸汽拖拉机用于农村的农业工作。
2. 2. The steam tractor was invented to improve farming efficiency.
   蒸汽拖拉机的发明是为了提高农业生产效率。
3. 3.The steam tractor has become a popular choice for farmers in many parts of the world.
   蒸汽拖拉机已经成为世界各地农民的热门选择。