C2 对…来说是陌生的
Something can be described as foreign to a particular person if they do not know about it or it is not within their experience.
The whole concept of democracy, she claimed, was utterly foreign to the present government. 她声称，民主这一整套概念对于现任政府来说是极其陌生的。
The very idea of using something again instead of throwing it away is completely foreign to them.
The disrespectful way he spoke about his parents was utterly foreign to us.
What is hard to understand is that the whole concept of social welfare is foreign to them.
These conventions are entirely foreign to us.
See also: foreign