People think and act independently may find out something new in the unknown area.

独立思考会发现更多未知的东西。

youdao

They could sail out for days into the unknown and assess the area, secure in the knowledge that if they didn't find anything, they could turn about and catch a swift ride back on the trade winds.

他们可以在未知的海域航行数天，并对该地区进行评估。他们知道如果没有发现任何东西的话，他们可以掉头，并借着信风迅速返回。

youdao

The part of the world we know is just as limited as the area an electric torch covers in the dark, while the rest part of the whole world remains unknown.

我们已知的世界就像黑夜中手电筒照亮的空间一样有限，未知部分是除了手电筒照亮空间之外的整个世界。

youdao

As the monitors were leaving the area, an unknown source fired at three vehicles, she said.

CNN: STORY HIGHLIGHTS

The robots create a 2D map of the area they are exploring, but when they come to an unknown area, they check back through this information to see if it seems similar to any areas that have already explored.

BBC: NEWS | Technology | 'Guessing' robots find their way

Such winds are not unknown in the San Francisco Bay Area.

FORBES: Digital Rules