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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Shelves this thing, carries many of the unknown world of our fantasies.

书架这东西，承载了我们对于未知世界的许多幻想。

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Would he stay behind the curtain and think about things, marinate in his own confusion, or would he put on his white fur suit and howl and scratch and make it known who was boss of this house and of all the world known and unknown?

NEWYORKER: Max at Sea

Not a great movie, but one of the great, unknown (in this country) stories of the Second World War.

NEWYORKER: John Rabe

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