We have not solved the problem (of) who was at fault.
我们没解决是谁的过失的问题。
The problem still exists. It's not solved yet.
问题还在，并没有解决。
However, in the real database, some special problems are also not solved.
然而，在真正的数据库中，一些特殊的问题还没有被解决。
If traffic problems are not solved soon, driving in cities will become impossible.
如果交通问题不解决，将来就不可能在城市里开车。
If traffic problems are not solved soon, driving in cities will become impossible.
如果交通问题不解决，将来就不可能在城市里开车。
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