adj. 1.未知的，未详的；未被发觉的。 2.数不清的，无数的。 短语和例子 a man unknown to me 我不知道[认识]的人。 unknown wealth 巨富。 unknown to …所不知道的；〔作副词用〕没有给…知道，不给…晓得 (He did it unknown to me. 他没有让我知道就做了那件事了)。 n. 未[不]认识的人[物]；【数学】未知数[量，元]。 the Great U- 伟大的匿名作家 〔Sir Walter Scott 的历史小说《威弗利》匿名出版时，人们对该书作者的尊称〕。 the U- Warrior [〔美国〕 Soldier] 无名战士〔其遗体被选出作为阵亡将士的代表接受国葬〕。 venture into the unknown 闯进未知世界中，大胆地探索未知的世界。
being or having an unknown or unnamed source; "a poem by an unknown author"; "corporations responsible to nameless owners"; "an unnamed donor" 同义词：nameless, unidentified, unnamed,
not known before; "used many strange words"; "saw many strange faces in the crowd"; "don''t let anyone unknown into the house" 同义词：strange,
not famous or acclaimed; "an obscure family"; "unsung heroes of the war" 同义词：obscure, unsung,
not known to exist; "things obscurely felt surged up from unknown depths"
a variable whose values are solutions of an equation 同义词：unknown quantity,
an unknown and unexplored region; "they came like angels out the unknown" 同义词：unknown region, terra incognita,
anyone who does not belong in the environment in which they are found 同义词：stranger, alien,
例句与用法
1.
His work is practically unknown here . 他的作品在这里实际上不为人知。
2.
What will the unknown devil bring ? 这个摸不透的恶魔会带来什么呢？
3.
The date of birth and death of qu yuan is unknown . 屈原的生卒年月不详。
4.
His whereabouts have been utterly unknown so far . 迄今他的下落全然未知。
5.
His present whereabouts is unknown . 他现在下落不明（不知道在什么地方）。
6.
The nascence of that kind of animal is unknown . 那种动物的起源不为人知。
7.
He stayed in an unknown city of revels . 他停留在一座不知名的狂欢之城中。
8.
The immediate cause of death is unknown . 死亡的直接原因不明。
9.
The science of intoning was unknown . 吟诵的学问还不为人所知。
10.
Whereabouts of the missing child is still unknown . 遗失的孩子还没有着落。
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