英语翻译Good service in a properly run big house was wonderful t

英语翻译
Good service in a properly run big house was wonderful training for a lot of girls who never would have seen anything different all the days of their lives if they hadn't gone.
我最近在看一本英文口语书,里边出现了这样一句话.但我看不太懂.
背景是：很多女孩子都会到英国去当au pair girl,也就是为了学习英语，跑到英国的某个家庭去，不取劳酬，在人家家里吃住，同时利用一些空闲时间学习英语的女孩子。这句话是在对这一现象评判的一篇文章里的一句话。