1.
That which is past or to a degree greater than knowledge or experience; the unknown.
超过或达到高于知识或经验之外的东西;未知之事。
2.
People from around the world flock to Machu Picchu to admire its stonework and interesting architecture─and ponder the unknowns.
世界各地的人纷纷前来马丘比丘欣赏其石工与耐人寻味的建筑，也默想种种未知之事。
3.
There is no knowing what may happen.
未来的事无法知道。
4.
He arrived unannounced.
他未事先通知而来到.
5.
to infer an unknown fact from a known fact
从已知的事实推断出未知的事实
6.
extrapolate from the known facts
从已知的事实推测未知的事
7.
"The larger the island of knowledge, the shore line of wonder."
知识之岛俞大,未知之海岸线俞长
8.
Person, place or thing that is unknown or unspecified
未知的或未确指的人、地点或事物
9.
trivial,unknown or unspecified thing
琐碎的、未知的或未指明的事物
10.
People usually infer an unknown fact from a known fact.
人们通常从已知的事实事中推断未知的事实。
11.
An unknown or unnamed factor, thing, or person.
未知之（人）物，不知道的或未命名的因素、物体或人
12.
The Paradox of Being Alive and Dead;
未知死,焉知生——读狄金森死亡之诗
13.
He can often infer an unknown fact from a known fact
他常常从一个已知的事实推断出未知的事实。
14.
Between these Rumsfeldian bookends, scientific skepticism was rampant.
在知与未知之间，正是科学怀疑论滋长之处。
15.
The designated Director must not deal in any securities of the Company without first notifying the chairman and receiving a dated written acknowledgement.
前述所指定的董事在未通知主席及接获注明日期的确认书之前，也不得买卖公司的任何证券。
16.
the unfailing childlike appetite for what-next and the joy of the game of living.
对未知的事物有着一股像孩子般永不冷却的热望，以及游戏人生的喜悦之情。
17.
We know nothing of what will happen in future, but by the analogy of past experience.--Abraham Lincoln
除了凭着过去的经验加以类推之外，我们对于未来所将发生的事情一无所知。——林肯
18.
It is hard to foresee what will happen.
很难预知将会发生之事。