Sentence examples for are a difficult problem from inspiring English sources

The choice and the definition of criteria for mud selection are a difficult problem for industrials.

Since it is a once-through steam generator and operates at a medium pressure (4.0 MPa), two-phase flow instabilities are a difficult problem (Functional Performance of the Helical Coil SG CNSG-IV System (1975)).

It is a difficult problem.

"That's a difficult problem".

It's a difficult problem.

How to do it is a difficult problem.

Reinvigorating democratic political competition is a difficult problem.

For patients, it can be a difficult problem to navigate.

"It is a difficult problem when you have a lack of oil," he said.

The walls erected by New York State are unsightly reminders that this is a difficult problem to solve.

Then there's the writing... .. 'He said, "Yes I see that is a difficult problem.