显然，地球深处发生了许多科学完全未知的事儿。
Clearly there is a lot going on deep in the Earth that is completely unknown to science.
太阳系外还有另外一个完全未知的宇宙，无人察觉。
There is a whole uncharted universe out there that nobody else is aware of.
不会是这样的！然而，事实是，这是一盘完全未知的带子。
No, that can't be it - it's simply that the casette is an entirely unknown quantity.
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