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Discover LudwigThe phrase "key lies in" is correct and usable in written English.
It is often used to emphasize that something important or fundamental is involved in the solution to a problem. For example: "The key lies in understanding the underlying causes of the problem."
Exact(60)
The key lies in debt to income ratios of prospective borrowers.
The key lies in how fast the U.S. labor market adjusts to slower growth.
No matter how you slice it, we all have 24 hours in a day, so the key lies in learning to use our time wisely.
For him, the key lies in the fleur-de-lis, the rose, the shamrock and the thistle that adorn this city's flag.
The key lies in Go's structure.
The key lies in not overdoing it.
The key lies in defining "them".
A key lies in Matyszczyk's blog.
The key lies in the design, it suggested.
The key lies in obtaining the first interviews.
The key lies in the fact of observation.
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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