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The phrase "a key role and" is correct and usable in written English.
It can be used when discussing the importance or significance of a particular role in a context, often followed by additional information or actions related to that role.
Example: "In the success of the project, a key role and contribution from each team member were essential."
Alternatives: "an important role and" or "a crucial role and".
Exact(60)
"The voluntary sector has a key role and it's not an add-on, it's an essential part of the whole".
Mr Davutoglu has played a key role (and, incidentally, blunted Iranian influence) in forging alliances between Shia and Sunni factions.
In the early days of the revolution, women played a key role and took an unprecedented place in Yemeni history.
Age and race also play a key role (and invariably have a direct bearing on shape and size, in turn).
In this context, seismic capacity models for concrete constructions with smooth reinforcement play a key role and need further development.
Lines were crossed – rarely has the red sprinters' lane played such a key role – and the commissaires tried to make sense of it all.
"Patients play a key role, and they're going to continue to play a key role," said Dr. Epstein of Novartis Oncology.
Parliaments also have a key role – and we are proud of the role that our own Joint Committee on Human Rights plays.
Amano has a key role and he "must be a leader and a consensus-builder who reports faithfully what experts tell him".
One thing seems clear: Shifts in the jet stream play a key role and could become even more disruptive as the world warms.
The HO2 and O2− radical disproportionations play a key role and control the potential at the interfaces under 6 MeV proton flux.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com