我以前是老师，因此当业务员对我来说是完全不同的行业。

I used to be a teacher, so being a salesman is a whole new ball game for me.

youdao

他以前是教工业艺术的老师，在我童年的记忆中，他和妈妈总是分分和和。

He was a former industrial-arts teacher whom my mother dated off and on for much of my childhood.

youdao

B在我有孩子以前，我是一个老师。

B Before I had my children, I was a teacher.

youdao

In both cases, this becomes part of their self-identity. That's an essential part as my good friend, Linda Colley, who used to teach here and sadly is not here anymore.

在这两个国家中,这点是他们身份认同感中很重要的一部分,如同我的好朋友,琳达·科里,她以前是这里的老师,很遗憾现在不在耶鲁了

耶鲁公开课 - 欧洲文明课程节选