Sentence examples for are frequently difficult to from inspiring English sources

The health effects of meth contamination are frequently difficult to prove, and research is scant.

After 1460 the two collaborated consistently, and the individual contributions of each are frequently difficult to determine.

It was not clear what charges will be pressed against those taken into custody, The A.P. reported, in part because laws against Internet crimes are unclear, and transnational crimes are frequently difficult to prosecute.

Critical to this are highly aligned fibers, which are frequently difficult to manufacture reproducibly.

However, they are frequently difficult to express recombinantly and can suffer from low conformational stability.

Wounds of the lower limb in patients with diabetes are frequently difficult to heal.

It is frequently difficult to follow the events, to share the fears, to feel the despair.

It is frequently difficult to distinguish the work of the various family members.

While identity theft is a crime, it is often committed across geographic boundaries, and it is frequently difficult to clearly identify someone as the thief.

The senior American security official said the source of warnings from foreign intelligence agencies was often unclear, and the volume was so great that serious threats were frequently difficult to separate from false alarms.

The problem was that, throughout the years when I was growing up in London, I supported Labour's policies, and agreed with its stated goals, but, in practice, my fellow Labour members were frequently difficult to distinguish from Conservative Powellites.