Sentence examples for difficult and persistent from inspiring English sources

"One of the most difficult and persistent problems facing any society," Woolf said, is how it meets "the responsibility to ensure that its members who are least able to protect themselves are provided with the assistance that they require to cope with the challenges with which they are inevitably faced.

It results in the situations of disability particularly difficult and persistent.

Coal fires are difficult and persistent problems throughout the world wherever coal is at or near the surface.

Early postoperative low-grade TKA infections generally present only with moderate knee pain and stiffness and/or difficult and delayed rehabilitation; persistent fever, severe pain, local warmth, erythema, and swelling are often absent.

And communities rarely have the appropriate programs, resources or specialists to deal with the most difficult cases of severe and persistent psychiatric disorders.

Yet it is unclear why these barriers remain so difficult to overcome despite numerous and persistent attempts at the design, communication and enforcement of related agricultural policies.

Nevertheless, it remains difficult to routinely direct efficient and persistent expression of small transgenes in transgenic mice.

Years of patient and persistent diplomacy, and difficult technical work, have borne fruit as we now implement the deal.

Years of patient and persistent diplomacy, and difficult technical work, have borne fruit as we now implement the deal," he said.

The exact composition of points can be adjusted, but this is our fair estimate for a balanced compromise, where passing the course is straightforward by abiding and persistent studying and difficult by random or cherry-pick studying.

These Trigona workers give a painful and persistent bite, are difficult to dislodge, and frequently die in the attack.