a powerful vehicle with two large and two smaller wheels, used especially for pulling farm machines 拖拉机；牵引机 
a farmer on his tractor 拖拉机上的农夫 the sound of a tractor ploughing in the field nearby 附近田里拖拉机作业的声音
Oxford Collocations Dictionaryadjective- agricultural
- farm
- lawn
- …
- drive
- use
- plough/plow
- work
- driver
- shed
- tyre/tire
- …
- on a/the tractor
- a tractor and trailer
- (North American English)
the front part of a tractor-trailer, where the driver sits （牵引式挂车的）牵引车，拖车头
Word Originlate 18th cent. (in the general sense ‘someone or something that pulls’): from Latin, from tract- ‘pulled’, from the verb trahere.