携带该病毒的确切人数尚不为人知。

The exact number of people carrying the virus is ___unknown.

就在几个月前，大多数人都还不知道她的名字。

Just a few months ago, her name was ___unknown to most people.

我们发现了一些来自不知名本地乐队的很棒的音乐。

We discovered some great music from ___unknown local bands.