Sentence examples for be a persistent problem from inspiring English sources

However, OME is described to be a persistent problem if effusion, or fluid, within the middle ear space persists for at least 3 months.

It does seem to be a persistent problem in a lot of organizations.

There had been efforts to increase the activity and interaction of CNTs through surface modification [69], however the toxicity of CNTs remains to be a persistent problem in biomedical application.

"This may be the economic capability that allows the Islamic State to be a persistent problem in Libya," said Braniff.

The evolution of warning coloration [1] has continued to be a persistent problem for evolutionary biologists.

Despite much investigation cerebral malaria continues to be a persistent problem leading to great morbidity and mortality in the developing world.

"It's been a persistent problem for some time".

Scorpions, both yellow and green, were a persistent problem.

This has been a persistent problem for him.

Long-term unemployment is a persistent problem in the US that has vexed even top economists.

Accessibility has been a persistent problem on the Web, particularly as it has grown more visual.