A heavy, powerful vehicle with big rough wheels, used mostly on farms. The key idea is that a tractor is a puller: on its own it does very little, but you hook a plough, a trailer, a cutter or a sprayer behind it and it drags that machine across the field. That is why the back wheels are so large and the machine is so slow — it is built for pulling power, not speed.

A heavy, powerful vehicle with big rough wheels一種笨重、強力、輪子又大又粗的車輛，used mostly on farms大多用在農場上。The key idea is that a tractor is a puller重點概念是tractor是一種拖曳者：on its own it does very little它自己單獨幾乎做不了什麼，but you hook a plough, a trailer, a cutter or a sprayer behind it但你在後面掛上犁、拖車、割草機或噴灑機，and it drags that machine across the field它就能把那台機器拖過田野。That is why the back wheels are so large and the machine is so slow這就是為什麼後輪這麼大、車速這麼慢 — it is built for pulling power, not speed它是為了拖曳力而造的，不是為了速度。

In everyday English it usually means the farm machine. In American English it also names the front unit of a big long-distance truck (see tractor-trailer), and in British English people sometimes call any big pulling machine on a building site a tractor loosely, though 'digger' or 'JCB' is more usual there.

In everyday English在日常英文裡，it usually means the farm machine它通常指農用機械。In American English在美式英文裡，it also names the front unit of a big long-distance truck它也可以指大型長途卡車的前段車頭 (see tractor-trailer)（見tractor-trailer），and in British English而在英式英文裡，people sometimes call any big pulling machine on a building site a tractor loosely人們有時會鬆散地把工地上任何大型拖曳機械都叫做tractor，though 'digger' or 'JCB' is more usual there不過那邊比較常說'digger'或'JCB'。

In Taiwan students often meet the word in reading about farming or in children's books before they ever see one, and the small hand-pushed tillers common in Taiwanese fields are not really tractors — those are 耕耘機.

In Taiwan在台灣，students often meet the word in reading about farming or in children's books學生常常是在讀到農業的文章或童書裡先遇到這個字，before they ever see one之後才真的看到實物；and而 the small hand-pushed tillers common in Taiwanese fields台灣田裡常見、用手推的小型耕耘機 are not really tractors其實不算真正的tractor — those are 耕耘機那些是耕耘機。