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Discover LudwigThe phrase "a central core" is correct and usable in written English.
It can be used to refer to the most important or fundamental part of something, often in a metaphorical sense.
Example: "At the heart of the organization, there is a central core of values that guide our decisions and actions."
Alternatives: "a fundamental essence" or "a key nucleus".
Exact(58)
They contain a central core in which the light travels.
Massive window walls, suspended from a central core, enclosed each of the two upper stories.
For Ms. Deaton, religion formed a central core of her life.
The Burj Dubai is made up of a central core with outriggers.
There remains a curiosity to DiDonato's voice: at times the bright surface seems to lack a central core of tone.
That is, a population headed toward extinction responds by contracting inward, reducing its range to a central core.
Wright modeled his buildings on trees, each floor cantilevering out from a central core like branches from a trunk.
In 1973, Ms. Chicago produced the work that changed her life, "Through the Flower," which depicts petals radiating from a central core.
The Mac Pro used innovative computer design to dissipate heat vertically through a central core, but somehow ended up looking like a wastepaper bin.
THREE of you now, in various shades and shapes, bred in differing climates, stretched in different directions, but all built around a central core.
The crystalline structure and its brick companion will be linked physically by a central core, containing elevators, stairs and utilities, and visually by a series of cantilevered balconies.
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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