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The phrase "a key role is" is correct and usable in written English.
It can be used to indicate the importance or significance of a particular role in a specific context or situation.
Example: "In the success of the project, a key role is played by the project manager who coordinates all activities."
Alternatives: "an essential function is" or "a crucial part is".
Exact(49)
Also likely to take a key role is Dan Colson.
A key role is played in turn by technology.
Also playing a key role is Emilia Tilsen, a Jutlander who becomes Kirsten's servant.
A key role is played by Oshima's (1988) criterion for temperedness.
A key role is played by proteins in maintaining optimal cardiac function under stress.
An area where in vitro tests play a key role is the genetic toxicology.
Similar(11)
One European country that played a key role was Denmark, the host, but this turned out to be an embarrassment.
Mr. Suozzi also disclosed that a key role was envisioned for Nassau if New York City officials ordered evacuations.
One of our biggest unknowns that ended up playing a key role was whether or not we would have a translators each day.
Among the local officials playing a key role are D.C. Council member Jack Evans (D-Ward 2) and Beverly Perry, a top aide to D.C. Mayor Muriel E. Bowser (D).
In Chernobyl, a key role was played by the "positive void coefficient" of the reactor core and the lack of an adequate containment structure.
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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