Sentence examples for difficult and defining from inspiring English sources

"All the world faces a test and the UN a difficult and defining moment.

"All the world now faces a test, and the United Nations a difficult and defining moment," Bush said.

He is a man who has been heavily influenced by the women in his life -- his mother, his wife, his daughters -- but also by a rich, difficult and defining relationship with his father, the senator.

Introduction: Professional behavior is difficult to measure and define.

The period since 1990, when Chile returned to democratic rule, is much more difficult to trace and define.

In addition, during dormancy, plants are completely quiescent; thus, the phenological phase during dormancy is difficult to observe and define.

Art-making for Shillinglaw is a means to "speak and celebrate aspects of the human condition which are difficult to describe and define... vulnerability, insecurity, and anxiety".

(009)" Many nurses found it difficult to articulate and define the meaning and constitution of 'nurse-led' service.

Therefore, it is difficult to quantify and define a standard range in normal response to stimuli within a healthy population.

Further, they proposed a causal link between the levels, with each becoming "increasingly integrated and increasingly difficult to define and measure".

In general, scientists agree that carbon sinks are important, but their properties are not well understood and they are difficult to define and measure.