Here you can explore the universe and the unknown mystery behind it!

你可以在这里探索宇宙和它背后未知的奥秘！

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Reading books builds a bridge between our lives and the unknown world.

读书在我们的现实生活和未知世界之间架起一座桥梁。

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Black is a mysterious color associated with fear and the unknown (black holes).

黑色是与恐惧和未知(黑洞)相关的神秘颜色。

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And the strong man, still holding the small child, drifted away on the shadowy river that flows forever to the unknown sea.

VOA: special.2009.06.06

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

The mathematical theory of probability was unknown until that time and you can see that insurance suddenly made an appearance at that time.

在那之前,概率的数学理论,是不存在的,而随着概率论的出现,保险业也突然出现了

耶鲁公开课 - 金融市场课程节选

The thought of your operation- and the unknown- has you in panic with your mind racing.

FORBES: Worried About Your Surgery? Skip the Valium and Download the App

Professor MACDUFFIE: My view on that is partly due to the exceptional circumstances and the unknown depths of the financial crisis.

NPR: What Can Automakers Do To Win Bailout?

The French investigation spoke of the risk of inflammation of the breast and the unknown potential risk from the untested silicone filler.

BBC: Review of breast implant safety