B1 not known or familiar未知的;不知名的;不了解的;不熟悉的
More examples
An unknown terrorist group has claimed responsibility for this morning's bomb attack.
A generation ago, home computers were virtually unknown.
The article is of unknown authorship .
The director took a calculated risk in giving the film's main role to an unknown actor.
The very concept of free speech is unknown to them.
C1 [ S ] what is not familiar or known陌生事物;未知事物
[ C ] a person, especially a performer or sports player, who is not famous无名小卒,无名之辈(尤指不知名的演员或运动员)
[ C ] mainly US something that cannot be guessed at or calculated because so little is known about it不明情况;未知因素
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