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Discover LudwigThe phrase "a key test" is correct and usable in written English.
It can be used when referring to an important or critical examination or evaluation of something.
Example: "The results of the experiment will serve as a key test for the new hypothesis we are exploring."
Alternatives: "a crucial assessment" or "an essential evaluation".
Exact(60)
Mazar will be a key test case.
OK, so why is this a key test case?
A key test will be whether he reshuffles the cabinet.
A key test of Tory policy will be: does it encourage responsibility?
It will be a key test of the conference's mood, and its loyalty to Clegg.
The elections are a key test of support for reform and for President Hassan Rouhani.
How builders respond to the measures will be a key test of their success.
"A key test is how any senator puts words into action," he said in a statement.
A key test will come Wednesday, when the opposition has called its next large-scale protest.
There is a key test before us with the new terrorism bill.
A key test comes Oct. 1, when insurance marketplaces open for enrollment.
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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