It's this sense of the unknown that makes the far side of the moon such an interesting place for scientific and space research.

正是这种对未知的感觉，使得月球的远侧成为科学和太空研究的一个有趣的地方。

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A real and pressing issue is that many plant species have not yet been cataloged, and so their place in the ecosystem is unknown.

一个现实而紧迫的问题是，许多植物物种还没有被编目，因此它们在生态系统中的位置是未知的。

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An abyss, an unknown dark place of great depth, would seem a frightening prospect.

一个“深渊”，一个未知的极深的黑暗所在，看起来都是可怖的景象。

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An inquest takes place when someone has died under suspicious or unknown conditions.

VOA: special.2009.08.31

Roth can evoke an unknown place and time with an exactness of sensory detail that is particularly alive to sounds and to changing light.

ECONOMIST: Modern fiction

As governments and companies place their bets, perhaps the biggest unknown is which technologies will win.

WSJ: Green Technologies Begin to Play Key Role in Global Economic Fight

However, whether the same processes take place in people or other animals is unknown.

BBC: Light in womb 'gives healthy eyes' - in mice