As those unknown territories shrunk on maps, a record was left of the limits of western man's world.

那些未知地域在地图上都缩小了，西方人所到达的世界边缘的档案被遗忘了。

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Without them, those unknown numbers of Poles or Baptists or car-salesmen will presumably go on climbing ladders; the jokes are safe.

没有白炽灯，那些很多不知名的波兰人、浸礼会教徒或汽车销售员估计会继续爬梯子；这个笑话并无恶意。

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Every decision should have a contingency plan for when those unknown unknowns arise and deem your primary course of action obsolete.

每一项决策都应该制定一项应对“未知的未知”和主要行动方案失败等情形的应急方案。

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I could take an unknown gas and put it in and measure it and then say, wow, those are the lines that are characteristic of sodium.

我取一种未知气体，把它放到管里,然后检测它，哇，这些线是钠的特征。

麻省理工公开课 - 固态化学导论课程节选

So what we're going to do is take the equations for those two lines, so here's one of those equations and here's the other one, set the P in those equations equal to X, I've got two equations in one unknown, I'm sorry, I've got one equation and one unknown.

接下来我们只需要,列出这两条线各自的方程,也就是这个方程和这个方程,把方程中的P换成X,我就得到了两个等式和一个未知数,错了,是一个等式和一个未知数

耶鲁公开课 - 博弈论课程节选

As those unknown territories shrunk on maps, a record was left of the limits of western man's world.

ECONOMIST: Modern man knows where he stands. His map tells him

To get an education on beaconing and how detection can uncover those unknown infections watch my interview with Stephen Newman.

FORBES: Uncovering the unknown threat via beaconing detection

Days passed, and not one of those unknown phone numbers lighting up his phone turned out to be a team offering a lifeline.

WSJ: What It's Like When a Player Loses His Job