at the farm 和on the farm 有什么区别?

at the farm 跟on the farm 有什么不同? on the farm 和 in the farm的区别 on farm on the farm 区别 弱弱的问下on the farm 与on a farm及at a farm的区别? 英语翻译是at a farm 还是on the farm 在农场上是on the farm还是in the farm还是at the farm? my uncle works on a farm now. 什么用介词on 而不用at on the farm =at on the farm On the farm作文 Animals on the farm: The sheep eats grass on the farm.和The exam begins at nine.两句 I______ride horse on the farm.