difficult

No matter the hour, officers would call detainees out of the room for interviews, making it difficult to get uninterrupted sleep, Minguela recounted.

But different agencies and researchers use different definitions of political violence, making comparisons difficult.

Dr Basu said breast density, which is higher in younger women's breast tissue, could also make breast cancer difficult to identify in a mammogram.

California lawmakers have responded with new legislation that aims to make offshore oil production more difficult by tightening the safety and regulatory requirements for pipelines.

Now in their fourth decade as a group, Nine Inch Nails — the duo of Reznor and producer/keyboardist Atticus Ross along with a closely held touring band — does two difficult things extraordinarily well.