The phrase "a core difficulty that" is correct and usable in written English.
You can use it when discussing a fundamental challenge or issue related to a specific topic or situation.
Example: "In our research, we identified a core difficulty that affects the accuracy of our data collection methods."
Alternatives: "a fundamental challenge that" or "a primary issue that".
The new report also reiterates a core difficulty that has plagued climate science for decades: While averages for such measures as temperature can be predicted with some confidence on a global scale, the coming changes still cannot be forecast reliably on a local scale.
Another, related, comes from the media's trap of asking science "is this hurricane caused by climate change?" The new report also reiterates a core difficulty that has plagued climate science for decades: While averages for such measures as temperature can be predicted with some confidence on a global scale, the coming changes still cannot be forecast reliably on a local scale.
The uncertainty about what is causing the strange winters highlights a core difficulty of climate science.
But at its core, the issue revolves around science, and in particular the difficulty that arises whenever scientists try to link any food to a chronic disease.
The film highlighted a real economic issue: the difficulty that markets have in putting a price on the impact of a company's core activity on the wider environment.
But others felt that this would not resolve the core difficulty of too much information coming from too many different sources: a midsize charity mentioned that their funded researchers publish in over a hundred journals.
The core difficulty of France, Germany and Italy is a lack of jobs.
The team realized that one of the core difficulties with planning an office space is that there is a level of uncertainty around which investments will pay off.
In sum, we find that recent experimental data disfavors all the best-motivated inflationary scenarios and introduces new, serious difficulties that cut to the core of the inflationary paradigm.
He also addressed the difficulties that have put the religion at the core of various conflicts from Afghanistan to Lebanon, Israel and Palestine.
Here, as in other areas, there is a huge difficulty in that the policies that attract and energise the core believers are precisely those that put off the peripheral and occasional ones on whom the church relies just as much.
