世界上有已知的未知，也就是说我们知道我们还不知道的那些事情。
There are known unknowns. That is to say there are things that we now know we don't know.
如果你还不知道这只是你的地图上所标示的地区的中间部分的Eorzea，有仍然在北探索未知的土地。
If you did not already know this, the regions marked on your map are just the middle portion of Eorzea, and there are unknown lands still explored in the North.
未知现象：目前人们还不知道的现象，包括其名称、性质、起源，以及它是否存在。
Unknown: at present people don't know some phenomena including the name, nature, origin and whether it is existent or not.
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