Sentence examples for have proved difficult from inspiring English sources

Propulsion systems have proved difficult to shrink.

But weight loss campaigns have proved difficult.

But these deals have proved difficult to manage.

There have been one or two attempts, but full mergers have proved difficult.

All three have proved difficult in the midst of the ongoing criminal investigation.

Attempts to get the birds off power and lighting fixtures have proved difficult.

But negotiations between the city and the unions have proved difficult.

But the few issues that still separate them have proved difficult.

Attempts to inject more competition into the industry have proved difficult.

Traditional hillslope plot experiments and paired watershed experiments have proved difficult to up-scale to a watershed level.

Though these interactions are illegal under the federal Marine Mammal Protection Act, they have proved difficult to prevent.