Sentence examples for proved extremely difficult to from inspiring English sources

Clear, colourless glass proved extremely difficult to achieve, however.

"But when this opportunity arose it proved extremely difficult to ignore.

But even within a protected area, it has proved extremely difficult to defend the species from illegal hunting.

Ragnar Sigurdsson – 7.2 A totemic presence in the centre of an Iceland defence that proved extremely difficult to break down.

But lawsuits under the 1990 Americans With Disabilities Act have proved extremely difficult to win, according to legal experts.

In the meantime, the public benefits of higher education — like more competitiveness in the global economy, lower health care costs — have proved extremely difficult to measure.

At its most extreme this can lead to entrenched attitudes of homophobia and racism that prove extremely difficult to shift.

There, said Peterson, we learned how differently oil behaves at extreme depths: forming suspended plumes rather than rising to the surface, and proving extremely difficult to control and to clean.

But it could prove extremely difficult to prosecute under American civilian or military laws.

The chemicals were proving extremely difficult to break down in the natural environment.

And it will prove extremely difficult to counter -- more so given Tehran's current resources.