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ADJ
不知道的；不了解的；未知的
If something is unknown to you, you have no knowledge of it.
例句
An unknown number of demonstrators were arrested...
有數目不詳的示威者遭到了逮捕。
How did you expect us to proceed on such a perilous expedition, through unknown terrain...
你怎么能指望我們如此冒險地穿越未知的地域，繼續這一探險？
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ADJ
不認識的；不熟悉的；陌生的
An unknown person is someone whose name you do not know or whose character you do not know anything about.
例句
Unknown thieves had forced their way into the apartment...
不知名的竊賊破門闖入了公寓。
I could not understand how someone with so many awards could be unknown to me.
我想不通自己竟然不認識獲了這么多獎的人。
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ADJ-GRADED
不出名的；無人知曉的；未獲公眾認可的
An unknown person is not famous or publicly recognized.
例句
He was an unknown writer.
他是個名不見經傳的作家。
...a popular environment where both established and unknown artists can meet, talk and drink.
成名和未成名的藝術家都可以聚會、聊天及喝酒的一處熱門場所
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ADJ
從未發生的；從未存在的
If you say that a particular problem or situation is unknown, you mean that it never occurs.
例句
A hundred years ago coronary heart disease was virtually unknown in Europe and America.
在100年前冠心病幾乎不存在于歐洲和美洲。
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N-SING
（總稱）未知事物，不為人知的地方
The unknown refers generally to things or places that people do not know about or understand.
例句
Ignorance of people brings fear, fear of the unknown.
人們的無知會帶來恐懼，對未知事物的恐懼。