unknown
- adj.未知的;不详的;无名的;不出名的;未被确认的;从未发生的;从不存在的
- n.未知数;未知的地方(或事物);未知的因素;无名者;不出名的人;不明的情况
复数： unknowns
un- 否定 + know 知道,了解
unknownadj.
未知的；不详的；未被确认的
not known or identified
a species of insect previously unknown to science
科学上以前尚未了解的一种昆虫
He was trying, for some unknown reason , to count the stars.
不知何故，他试图数星星。
The man's identity remains unknown.
这名男子的身份还是个谜。
不出名的；无名的
not famous or well known
an unknown actor
没有名气的演员
The author is virtually unknown outside Poland.
在波兰以外，这位作者实际上鲜为人知。
从未发生的；从不存在的
never happening or existing
The disease is as yet unknown in Europe (= there have been no cases there) .
这种疾病至今尚未在欧洲出现过。
It was not unknown for people to have to wait several hours (= it happened sometimes) .
人们得等几个小时的事时有发生。
a person or thing whose qualities or abilities are not yet known
without the person mentioned being aware of it
他背着我已签了协议。
Unknown to me, he had already signed the agreement.
noun
未知的地方（或事物）
places or things that are not known about
a journey into the unknown
探险之旅
a fear of the unknown
对未知事物的恐惧
无名者；不出名的人
a person who is not well known
A young unknown played the leading role.
演主角的是一个名不见经传的年轻人。
不明的情况；未知的因素
a fact or an influence that is not known
There are so many unknowns in the proposal.
这项提案中的未知数太多了。
未知数；未知量
a quantity that does not have a known value
X and Y in the equation are both unknowns.
等式中的X和Y都是未知数。
unknown
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1
ADJ 不知道的；不了解的；未知的
If something is unknown to you, you have no knowledge of it.An unknown number of demonstrators were arrested...
有数目不详的示威者遭到了逮捕。
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2
ADJ 不认识的；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.Unknown thieves had forced their way into the apartment...
不知名的窃贼破门闯入了公寓。
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3
ADJ-GRADED 不出名的；无人知晓的；未获公众认可的
An unknown person is not famous or publicly recognized.He was an unknown writer.
他是个名不见经传的作家。
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4
ADJ 从未发生的；从未存在的
If you say that a particular problem or situation is unknown, you mean that it never occurs.A hundred years ago coronary heart disease was virtually unknown in Europe and America.
在100年前冠心病几乎不存在于欧洲和美洲。
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5
N-SING （总称）未知事物，不为人知的地方
The unknown refers generally to things or places that people do not know about or understand.Ignorance of people brings fear, fear of the unknown.
人们的无知会带来恐惧，对未知事物的恐惧。
noun
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1
- a variable whose values are solutions of an equation
- Synonym: unknown quantity
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2
- an unknown and unexplored region
- they came like angels out the unknown
- Synonym: unknown region terra incognita
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3
- anyone who does not belong in the environment in which they are found
- Synonym: stranger alien
adj
-
1
- being or having an unknown or unnamed source
- a poem by an unknown author
- corporations responsible to nameless owners
- an unnamed donor
- Synonym: nameless unidentified unnamed
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2
- not known before
- used many strange words
- saw many strange faces in the crowd
- don't let anyone unknown into the house
- Synonym: strange
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3
- not famous or acclaimed
- an obscure family
- unsung heroes of the war
- Synonym: obscure unsung
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4
- not known
- an unknown amount
- an unknown island
- an unknown writer
- an unknown source
-
5
- not known to exist
- things obscurely felt surged up from unknown depths
数据来源：WordNet
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How did you expect us to proceed on such a perilous expedition , through unknown terrain
你怎么能指望我们如此冒险地穿越未知的地域，继续这一探险？
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According to Leslie , those who ridiculed former Defense Secretary Donald Rumsfeld for his 2002 remark that we have to be wary of the " unknown unknowns " were mistaken .
莱斯利认为，前国防部长唐纳德·拉姆斯菲尔德在2002年说，我们要警惕那些“未知的未知”，那些因此而嘲笑他的人是错误的。
-
The disease is as yet unknown in Europe .
这种疾病至今尚未在欧洲出现过。
-
A young unknown played the leading role .
演主角的是一个名不见经传的年轻人。
-
The man 's identity remains unknown .
这名男子的身份还是个谜。
-
He was trying , for some unknown reason , to count the stars .
不知何故，他试图数星星。
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The verdict was murder by a person or persons unknown .
裁断是一人或多人谋杀，凶手身份未明。
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Thanks to the automobile , Americans soon had a freedom of movement previously unknown .
由于有了汽车，美国人很快就获得了前所未有的行动自由。
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The author is virtually unknown outside Poland .
在波兰以外，这位作者实际上鲜为人知。
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His whereabouts are / is still unknown .
他仍下落不明。
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The authorship of the poem is unknown .
这首诗的作者不详。
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Exactly which bacteria cause the infection is still unknown .
到底是什么细菌引起的感染还不清楚。
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Ignorance of people brings fear , fear of the unknown .
人们的无知会带来恐惧，对未知事物的恐惧。
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I could not understand how someone with so many awards could be unknown to me .
我想不通自己竟然不认识获了这么多奖的人。
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Once more he 's making a leap into the unknown without a plan .
他再次毫无计划地乱闯。
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A hundred years ago coronary heart disease was virtually unknown in Europe and America .
在100年前冠心病几乎不存在于欧洲和美洲。
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The contract was awarded to a previously unknown company
合同签给了一个之前并不知名的公司。
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Unknown thieves had forced their way into the apartment
不知名的窃贼破门闯入了公寓。
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He is an unknown quantity for his rivals .
对于对手们而言，他是个未知数。
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The timing of the attack , and its motivations , are unknown .
袭击发生的时间及其动机尚不清楚。
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The condition is practically unknown outside psychiatry clinics .
除了医院的精神病科外，这种病几乎不为人知。
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He was an unknown writer .
他是个名不见经传的作家。
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The motive for the killing is unknown .
杀人动机不明。
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It is not unknown for valuable display items to go , ahem , missing .
贵重的展品，呃哼，丢失的话，会众人皆知。
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The letter had come from an unknown mischief-maker .
这封信来自一个匿名的离间者。
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An unknown number of demonstrators were arrested
有数目不详的示威者遭到了逮捕。
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My husband , for some unknown reason , suggested that I loved my birds more than him : as if I would
我丈夫，莫名其妙地，暗示我爱鸟甚于爱他：仿佛我真如此似的。
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Unknown attackers riddled two homes with gunfire
来路不明的袭击者用枪炮将两处住宅打得千疮百孔。
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The exact location of the plane crash is still unknown .
飞机失事的确切位置还不清楚。
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The actual cause of this quake is still unknown .
这次地震的真正原因仍不清楚。
- 习语
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