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The phrase "a protective shell" is correct and usable in written English.
It can be used to describe a physical or metaphorical barrier that offers protection or safety.
Example: "The turtle retreats into its protective shell when it senses danger approaching."
Alternatives: "a safety barrier" or "a defensive covering."
Exact(46)
During periods of environmental stress or nutrient depletion, certain Gram-positive bacteria use sporulation to protect its DNA within a protective shell.
If you are playing with monsters on, you might want to protect your chest from exploding Creepers by building a protective shell around it.
Trees curve over her like a protective shell.
Perforated aluminum screens form a protective shell over long glass walls.
This waxy scale cover is secreted by the female and serves as a protective shell.
In Ms. Castillo's case, it is as if she's coated with a protective shell.
Similar(14)
There was a stronger-than-usual outer shell — a protective shield — coming between the lingerie-light underthings and the firm coats.
In mature coconut, the pulp (28% weight) is surrounded by a hard protective shell (12% weight), which is covered by a thick husk (35% weight) [ 3].
For example, a hepatitis C virus (HCV) [4], about 50 nm in size, is constituted of an inner core of RNA genetic materials, an icosahedral protective shell of protein, and a lipid envelope.
The nanoparticles proved to be an effective protective shell for an entrapped enzyme that was released upon degradation of the polyester by esterase.
I was really inspired by shapes of insects like beetles that have a hard protective shell.
More suggestions(4)
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com