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The phrase "a key role when" is correct and usable in written English.
It can be used to indicate the importance of a particular role or function in relation to a specific situation or event.
Example: "The manager plays a key role when coordinating the team's efforts during a crisis."
Alternatives: "an essential role in" or "a crucial part during".
Exact(29)
House was wildly popular here and played a key role when the Celtics won the 2008 championship.
The Canadian Kevin Tyler is expected to be given a key role when UK Athletics announces its new team to take over from Charles van Commenee on Thursday.
Although audits play a key role when evaluating for pay discrimination, "it's important to understand that just giving women more money is not the long term answer to the gender pay gap because the issue has complex components", Roderick says.
Trust will also play a key role when serving editorial content or making purchase decisions.
Spatial notions play a key role when humans and robots interact.
Google search plays a key role when consumers are watching television, as users turn to their screens during breaks.
Similar(31)
Police officers were included due to their key role when a person with dementia is reported missing.
Nanoparticles' properties are in key role when new biomedical applications are considered.
But Balding has played a key role too – when she signed up with broadcasters BT Sport she requested they show more women's sport.
Plan Ahead Elevation plays a key role in when and how quickly leaves change color.
The Queen was in good company with two other famous nonagenarians playing key roles when naturalist Sir David Attenborough read aloud Reflection on the Passing of Years, penned by Michael Bond, creator of Paddington Bear and a personal evocation what it was like to be vintage 1926.
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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