When you are lost in an unknown place, you can ask the police for directions.
我有地址。我们可以在这里下车，然后再问路。
You may be serving in obscurity in some small place, feeling unknown and unappreciated.
你可能在一个小地方默默奉献，无人知道无人赏识。
When and where this took place is still unknown.
这事在何时何地发生至今还不清楚。
When and where this took place is still unknown.
这事在何时何地发生至今还不清楚。
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