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Discover LudwigSuggestions(5)
'a key difference' is correct and usable in written English.
You can use it when you are comparing two or more subjects and you want to emphasize that one difference between them stands out above all other differences. For example: "One key difference between the two candidates running for office is their environmental policies."
Exact(58)
A key difference between these different metrics is the method used to calculate the IC.
A key difference was that Honduras is in Central America, "our backyard," so different rules applied.
But there is a key difference.
There is a key difference here though.
There's a key difference between Nabokov and Sheldon.
The varied outcomes come back to a key difference: regulation.
That's a key difference that needs to be highlighted.
We see a key difference between the reinsurance and the shareholder risk.
But there is a key difference between the way we teach science and religious teachings.
The meanderings get more twisted when we consider a key difference between Google and Apple.
A key difference to the UK is the professionalism of the landlords.
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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