Sentence examples for been difficult to resolve from inspiring English sources

But they had been "difficult to resolve effectively because of limitations imposed by conditions at the time".

This debate has been difficult to resolve, in large part because very few people in the world today are not familiar with Western music.

Until now, it has been difficult to resolve whether past changes in the ocean conveyor belt occurred before or after the abrupt climate shifts that punctuated the last deglaciation in the Northern Hemisphere.

Deep avian evolutionary relationships have been difficult to resolve as a result of a putative explosive radiation.

Invariably, these different aspects of organismal biology were studied in isolation and resulted in conflicting ideas of animal relationships that have been difficult to resolve (Jenner and Schram 1999).

Liu Zhenmin, China's vice foreign minister, said financial questions have been difficult to resolve.

Certainly, these questions are difficult to resolve.

Zittrain said it may be difficult to resolve the matter definitively.

As the New York Times' Charlie Savage notes this morning, the conflicting claims are difficult to resolve.

The therapeutic problems of giant incisional hernias of the abdominal wall are difficult to resolve.

Inappropriate planning can cause implant loss and aesthetics problems that are difficult to resolve.