on the farm 为什么用on

on the farm 为什么用on on the farm 为什么不是in the farm on farm on the farm 区别 on the farm On the farm作文 Animals on the farm: But always there is so much to do On the farm为什么用on I______ride horse on the farm. There is a sheep and two cows on the farm.为什么要用is my uncle works on a farm now. 什么用介词on 而不用at on the farm =at 应该用on farm 还是on tne farm a farm前跟介词为什么用on?