be born on the farm是在农场出生的意思，而in the farm则是在农场里的意思，区别可以从以下例子看出：
I was born on the farm long time ago, since then I have been in the farm for over 30 years. 我很久以前出生在农场，从那时起我已经在农场工作了 30 多年。
be born on the farm是在农场出生的意思，而in the farm则是在农场里的意思，区别可以从以下例子看出：
I was born on the farm long time ago, since then I have been in the farm for over 30 years. 我很久以前出生在农场，从那时起我已经在农场工作了 30 多年。
