Sentence examples similar to cooperation has been difficult from inspiring English sources

Nevertheless, when tested in natural populations and in laboratory conditions, some types of cooperation have been difficult to validate.

To be totally effective these schemes need complete public cooperation, a requirement that has been difficult to achieve.

It has been difficult.

Making progress has been difficult.

Her recuperation has been difficult.

The Senate report also cautioned that one source for the 1994 meeting was an Italian newspaper article published four years later and that other information came from "raw reports from foreign sources". Two senior bin Laden lieutenants now in CIA custody, Abu Zubaida and Khalid Sheik Mohammed, both insisted that al Qaeda cooperation with Iraq would have been difficult.

But their cooperation has been limited at best, and with the presidential campaign in full swing, it will be difficult for them to agree on all but the most noncontroversial questions.

Counterterrorist cooperation has been a longstanding feature of the secret cooperation.

In our experience, cooperation has been good.

So far intersectorial cooperation has been focused on MRSA- management.

In the past year, improved cooperation has been evident.