Sentence examples for countless difficult problems from inspiring English sources

Secretary of Defense Leon Panetta has solved countless difficult problems in his years of public service, but he calls the problem of mental health treatment one of the most frustrating of his career.

I love difficult problems.

Both of these options pose difficult problems.

His partner, Adam Wildavsky, faced difficult problems.

That creates some very difficult problems".

It appears to be a difficult problem, but academics are used to dealing with difficult problems.

Think about the really difficult problems.

It is a difficult problem.

It's a difficult problem.

"That's a difficult problem".

This is an incredibly difficult problem.