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Discover LudwigThe phrase 'the two key' is correct and usable in written English.
It can be used to refer to two specific items that are important or integral to something. For example, "The two key ingredients in this recipe are sugar and cinnamon."
Exact(58)
These are the two key findings.
The two key speakers are Caroline Flint and Stephen Byers.
The two key issues now may be one of politics, and one of judgment.
The judge seemed to single out the two key prosecution witnesses, Mr. Guzman and Mr. Benefield.
"Theory" and "scholarship" are the two key words in the question.
Ads for the two key appointments will be placed in the Sunday Times on 24 February.
They were the two key words because he was a very correct and fair man.
Kanner describes one of the two key symptoms as "extreme aloneness from the beginning of life".
It brought together the two key South African batsmen in Amla and De Villiers.
Advertisements for the two key appointments in TV and news were published last month.
Similar(1)
Now it is the two-key method that prompts some complaints.
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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