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'hollow sphere' is a correct and usable phrase in written English.
You can use it when referring to a three-dimensional object that is essentially a hollowed-out sphere. For example, "The scientists constructed a hollow sphere from the metal alloy."
Exact(58)
At the heart of any submersible lies the hollow sphere where the aquanauts work.
Now imagine a moon apple: a hollow sphere of lunar light.
Cleavage of a fertilized egg produces a hollow sphere of flagellated cells (the blastula).
The embryo, a hollow sphere of cells a few days old, is destroyed in the process.
An embryo is essentially a hollow sphere with an inner mass of all-purpose cells, known as embryonic stem cells.
Multiple curing stages shape and work the slug into half shells, and then into a hollow sphere.
BLASTOCYST A hollow sphere of some 250 cells that develop four to five days after an egg is fertilized.
1b; (f), hollow sphere Cu2O shown in Figure4d.
(d) Typical TEM image of a ZnO hollow sphere.
Similar(2)
(c) Typical TEM image of the ZnO hollow-sphere nanofilm.
(b) Power distribution of the ZnO hollow-sphere nanofilm at 370 nm.
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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