Sentence examples for the difficult challenge was from inspiring English sources

"What's interesting; however, is that their ability to do the difficult challenge was unaffected by THC.

The difficult challenge is to ensure we live by them.

"The difficult challenge is to expand the tax base". At present, Mexico's non-oil tax revenue is equivalent to about 11% of GDP.

The difficult challenge is to validate the correlation with marker uptake and the presence of viable hypoxic cells.

The difficult challenge is to separate the theoretically based and substantively informative yet failing models from models that failed because they were ill conceived nonsense.

But the answer to this difficult challenge is to double down on efforts to keep girls in school, to defy them, as Malala Yousafzai and other courageous girls have done.

The architect in charge of the reconstruction, who spoke on the condition of anonymity because he was not authorized to talk about the project, said the most difficult challenge was working without blueprints.

The project lasted for many years and the most difficult challenge was to obtain model parameters prioritizing the use of local epidemiological data and costs.

The more difficult challenge was hiding her pregnancy from her boyfriend.

American and Iraqi officials said the most difficult challenge was ahead, in re-establishing governmental authority and holding off what is certain to be a new round of attacks from guerrillas who melted away before the surging armies.

Tzetzes' most difficult challenge was the Greek gods.