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Discover Ludwig'but the key' is a correct and usable phrase in written English.
You can use it to introduce a contrast or caveat to a statement. For example: "I think this is the answer we've been looking for, but the key is to make sure it works in practice."
Exact(60)
But the key is running.
But the key was definitely there.
But the key term is "follow-up".
But the key is her focus.
But the key question is: when?
But the key word is "madly".
But the key area will be upstairs.
But the key arena is Europe.
But the key ingredient is old bread.
But the key, she said, is control.
But the key point stands.
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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