Sentence examples for have been difficult to explain from inspiring English sources

These observations have been difficult to explain, Jones says.

Such increases have been difficult to explain, though the lack of infection control within hospitals, an increase in the number of people carrying MRSA, and the generation of MRSA strains that affect healthy individuals within communities appear to be major contributing factors.

"The cloud may have been difficult to explain at one time.

It would have been difficult to explain that the very languages they were trying eradicate in America had been instrumental in communicating on the battlefield.

Some of the results in our study have been difficult to explain but should be mentioned for future research purposes.

Furthermore, performing endoscopies in controls to assess Helicobacter pylori status through biopsies would have been difficult to explain and could be even considered unethical.

A. It has been difficult to explain why some countries, including Finland, have been performing well in international school system comparisons.

Even the most obvious feature of influenza's global migration cycle — that it emerges in temperate regions in both the Northern and Southern Hemispheres during cold months — had been difficult to explain.

Nick Seddon, deputy director of the centre-right thinktank Reform, says it has been difficult to explain to people how the "big society" will work – to get the idea across – because it is utopian.

It has been difficult to explain why only some individuals with production of monoclonal immunoglobulin light chains develop systemic amyloidosis.

The abundance of infrequent non-synonymous variants in human populations has been difficult to explain in terms of adaptive shift.