Sentence examples for a core problem is that from inspiring English sources

"A core problem is that some of the big integrated companies got their nuclear and coal plants out of the regulated system at very, very low prices and are now making money hand over fist by selling power back to their regulated utility arms," she said.

According to Pamela Yellen, author of The Bank on Yourself Revolution, a core problem is that, "Americans don't understand the difference between saving and investing.

A core problem is that 38%, mostly girls, do not have access to education, which directly impacts enrollment: on average, there are 55 girls for every 100 boys enrolled in secondary school.

The core problem is that cooking is defined as work, and fast food is both a pleasure and a crutch.

The core problem is that Iran has successfully hidden the extent of its nuclear program, and its progress.

The core problem was that deep links only really worked if a user already had the app.

The core problem was that human brains had not had an upgrade since the Pleistocene epoch, yet jets required human decisions at more than triple the tempo of propeller-driven aircraft.

The core problem being that galleries aren't typically short of artworks to hang on their walls.

The core problem is that, while an ID itself is free, through the Department of Motor Vehicles (DMV), the underlying documentation required to get an ID can be expensive to obtain and time-consuming to assemble.

Yet the core problem is that Japan suffers from a gross misallocation of resources, both financial and human.Japan has long kept the cost of capital low, to boost investment or help stragglers.

The core problem is that by saying there is a single source for modal knowledge via knowledge of essence Lowe has potentially undermined his ability to provide an account of how one can know (B).