Sentence examples for problems are difficult from inspiring English sources

The answer is that all these problems are difficult.

Ill-structured problems are difficult types to solve.

Almost by definition, these problems are difficult; that's why Clinton and Bush also failed to act.

Analytical solutions for three-dimensional wedge problems are difficult to obtain.

The problems are difficult to solve if the description of the underlying electronic structure is not good enough.

Because their clients' problems are difficult and one of a kind, the consultants can charge high fees for their services.

Negotiating these pooling problems is difficult under any circumstance.

It is explained why CFD application to wind engineering problems is difficult.

Determining how often, if ever, blood supplied by the Red Cross has been responsible for serious health problems is difficult.

Michael B. Kaplowitz, a Westchester County legislator, said Mr. Tompkins's problems were "difficult, problematic but not ultimately a death knell".

This class of real-world problems is difficult to study in the real world.