have never heard of
另一张字条来自又一位图书管理员,一个我从未听说过的人。
Another note came from another librarian, someone I’d never heard of.
你从未听说过信任吗?
Have you never heard of trust?
— 隐藏摄像机 (2005)
但即便这样,我也从未听说过如此可怕的事情
But even so, I’ve never heard of anything so terrifying.
— 罗生门 (1950)
我从未听说过他
I've never heard of him.
— 西部往事 (1968)