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Discover LudwigSuggestions(5)
"key for" is correct and usable in written English.
You can use it when something is necessary to gain access, understand, or complete something. For example: "The key for success in life is hard work and dedication."
Exact(58)
"That was a big key for us".
That discovery is key for Ms. Wilcox.
"He's been a key for us.
"Moving the ball was key for us".
That could be key for Arsenal.
"Public acceptability is key for government action.
"This was key for us," Revis said.
The key for us was our defense".
That was key for both of them".
"Inflation is key for real assets.
"Jeff was key for us.
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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