Often, when I am reading a good book, I stop and thank my teacher. That is, I used to, until she got an unlisted number. ~ Author unknown.

每当我阅读一本好书，总会停下来感谢我的老师。更确切地说，我过去常这么做，直到她换了电话号码，号码簿中找不到。

youdao

That an unknown high school teacher from a minority community could run for presidency and beat seasoned politicians was unheard of.

BBC: Africa

Hull was an unknown Canadian journalist and Peter was a Canadian teacher who had also been a counsellor, school psychologist, prison instructor and consultant.

ECONOMIST: Guru

In October 2000 a Wexford school teacher, Eoin Colfer, won the largest advance ever paid to an unknown writer in Britain for his children's book, Artemis Fowl.

BBC: Irish PM's daughter signs book deal