Sentence examples for difficult problem to crack from inspiring English sources

"The big, looming, difficult problem to crack is the general adult population and the millions of people with multiple partners and overlapping relationships.

I'm sorry for our supporters but we've tried almost everything and are finding it a difficult problem to crack.

Reliably forecasting the timing, location, and magnitude of an earthquake has been a difficult problem to crack.

With one especially tough problem to crack: how to present the largely immobilized guest of honor.

"It's a difficult problem to quantify".

Even with the best of will, this problem is difficult to crack.

He began work in 1974 having accepted an academic position at UCSF and despite colleges' warnings that the problem would be too difficult to crack.

"This is a very difficult case to crack," Musole said.

Even so, India could remain a difficult market to crack.

"It's the most difficult one to crack.

China has been a notoriously difficult market to crack for overseas Web companies.