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Discover LudwigThe phrase "a key for" is correct and usable in written English.
It can be used to indicate something that provides access, understanding, or a solution to a problem or situation.
Example: "This document serves as a key for understanding the complex regulations in our industry."
Alternatives: "a solution to" or "a means of".
Exact(60)
"He's been a key for us.
A key for a safe deposit box.
Resilience was a key for the Knicks.
A boat arrived without a key for the engine.
You've got to have a key for your twenty-first".
I felt relaxed, that's a key for me".
That was a key for me, it really was.
Odom's presence could be a key for Los Angeles.
And neither she nor the man in his underpants had a key for it.
Petke's marking of Chicago's Hristo Stoichkov will be a key for the MetroStars tonight.
She said she'd leave a key for me.' Then he walks upstairs and cleans her out".
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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