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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This spaceship is about to start an exciting voyage into an unknown world.

这艘宇宙飞船即将开始一趟振奋人心的未知世界之旅。

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This is an unknown world to River.

这对河床来说是一个未知的世界。

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And they feel that unknown dangers in the business world threaten the survival of their business.

VOA: special.2010.05.16

She died in eighteen eighty-six, at the age of fifty-five, completely unknown to the world.

VOA: special.2010.07.18

"The situation is somehow much more unknown to the Western world and was not particularly described in the media and it was particularly touching."

VOA: standard.2010.06.29

And only 10% of the life forms inhabiting that unknown world are known to those on the surface.

FORBES: Richard Branson On Exploring The Final Frontier

But to achieve this, tech companies must encourage users to make a leap into an unknown world and throw private information into a void.

CNN: With new mobile apps, no one's a stranger

"Russians are not used to encountering disabled people in the street ... yet for the first time, they discovered a previously unknown sporting world and its courageous fighters, " the paper said.

CNN: London 2012 delivers unexpected legacy