If you are in an unknown area it is a warning to be careful of enemies.

如果您是在未知的领域，这是一个警告要小心敌人。

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Simulation calculation of deep buried and unknown area was conducted and CBM geologic evolution process in the area was founded out.

对盆地深部未知区进行模拟计算，查明了未知区山西组主煤层煤层气地质演化史特征。

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The largest unknown area is the UK's future in the customs union, which provides for the frictionless movement of goods across Europe.

最大的悬念是英国在欧洲关税同盟的未来，后者使得商品可以在欧洲境内畅通无阻地流通。

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It was an unknown area going in.

NPR: Barbaro Makes Progress After Leg Surgery

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

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

CNN: STORY HIGHLIGHTS