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Discover LudwigThe phrase "at key" is not correct and does not convey a clear meaning in written English.
Without additional context, it is difficult to determine when it could be used appropriately.
Example: "The information is located at key locations in the document." (Note: "at key" is part of a larger phrase here.)
Alternatives: "at crucial" or "at important".
Exact(59)
AT: Key participant in study conception and design.
We need to finish at key times.
National Guardsmen are posted at key bridges and tunnels.
At key stage 5, things get a little more technical.
I thought he served incredibly well at key moments.
Wallace Stevens and his "Idea of Order at Key West".
41 Wallace Stevens, "The Idea of Order at Key West".
Such an outcome seemed unlikely at key points yesterday.
At key moments, "Lucky You" loses its nerve.
Nadal produced his best shots at key moments.
Reid has relied on too many rookies at key positions.
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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