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Discover LudwigThe phrase "are sound" is correct and usable in written English.
You can use it to mean that something is firmly established or that the underlying basis of something is correct. For example, "The assumptions behind this model are sound and so we can proceed with confidence."
Dictionary
Exact(60)
Legal systems are sound.
Yet ratings are sound.
Macroeconomic policies are sound.
"The fundamentals are sound.
Rick Perry's fundamentals are sound.
Mr Milburn's motives are sound.
The commission's recommendations are sound.
The auspices are sound artistically.
All are sound suggestions.
These are sound buys.
Those are sound principles.
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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