Sentence examples for are a difficult and from inspiring English sources

Shozo Yokoyama, an evolutionary biologist at Syracuse University in New York state, says Zhang's functional tests are a difficult and essential step toward understanding the role of duplication.

I have always believed and known that the teenage years are a difficult and unbalanced period of life.

Expectations are a difficult and complicated thing to live up to, and we often move through life with preconceptions of what they are, in my case from my father.

Food composition regulations are a difficult and low priority way to promote the intake of healthy components of food.

Central nervous system (CNS) infections in ICU patients after neurosurgery are a difficult and life-threatening complication demanding immediate action.

It's a difficult and emotional task.

That's a difficult and disturbing question.

It's a difficult and a painful situation.

Rio has always been a difficult and complex city.

National grief is a difficult and complicated process.

The US can be a difficult and confusing export destination.