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The phrase "are key when" is correct and usable in written English.
It can be used to indicate the importance of certain factors or elements in a specific context or situation.
Example: "Effective communication and teamwork are key when managing a successful project."
Alternatives: "are crucial when" or "are essential when".
Exact(20)
Green technologies are key when developing a smart city, and Stockholm, one of Europe's most connected cities, knows this.
"We say, 'If anyone threatens you, give a call.' The foot patrols are key: when you see someone walking down your street, when you see a face — it's different," Brooks said.
They are key when it comes to making companies like Relay FM possible.
These APIs are key when you have less than 24 hours to put something together.
Convenience and comfort are key when you're talking about shipping and receiving, and Swapbox cares about both of those things.
Demographics, infrastructure finance, public-private partnerships, and new modes of transportation are key when thinking about these coming shifts.
Similar(40)
Education is key when it comes to a healthy lifestyle.
Persistence is key when making a career transition.
Contrast is key when it comes to your makeup, too.
"The power of substitution is key when we're so pinched for time," she said.
Presenting partnerships as being about learning and not evaluation is key when talking about failure.
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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