unknown

1. ADJ If something is unknown to you, you have no knowledge of it. 不了解的

An unknown number of demonstrators were arrested. 不知多少示威者被逮捕了。

The motive for the killing is unknown. 杀人的动机不明。

2. N-COUNT An unknown is something that is unknown. 未知的事物

The length of the war is one of the biggest unknowns. 战争的持续时间是其中一个最大的未知数。

3. ADJ An unknown person is someone whose name you do not know or whose character you do not know anything about. (姓名或性格) 未知的

...the tomb of the unknown soldier. …那名无名士兵的墓。

4. ADJ An unknown person is not famous or publicly recognized. 不出名的

He was an unknown writer. 他是个没有名气的作家。

5. N-COUNT An unknown is a person who is unknown. 不为人知的人

Within a short space of time a group of complete unknowns had established a wholly original form of humour. 在短短的一段时间内，一群完全不为人知的人已始创了一种新式幽默。

6. ADJ If you say that a particular problem or situation is unknown, you mean that it never occurs. 从未发生过的

A hundred years ago coronary heart disease was virtually unknown in America. 100年前，冠心病在美国几乎从未有过。

7. N-SING The unknown refers generally to things or places that people do not know about or understand. 未知事物

Ignorance of people brings fear, fear of the unknown. 人的无知带来了恐惧，对未知事物的恐惧。