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The phrase "are mostly unknown" is correct and can be used in written English.
It is typically used to describe things or ideas that are not well known or understood. For example: - The origins of this ancient artifact are mostly unknown. - Despite his fame, the details of the author's personal life are mostly unknown to the public. - The long-term effects of this new drug are mostly unknown, as it has only been tested on a small group of individuals. - The customs and traditions of this indigenous tribe are mostly unknown outside of their community. In each of these examples, "are mostly unknown" is used to describe something that is not fully known or understood.
Exact(60)
But career-training programs are mostly unknown, and Manq'a took off.
Even the inventors of successful languages are mostly unknown within the industry, let alone outside it.
The results are pleasantly varied, produced by artists from around the country whose names are mostly unknown.
We meet the Guardians, who are mostly unknown to each other, as they are to be incarcerated in an elaborate space prison known as the Kyln.
"Everybody looks famous and everybody looks interesting, but are mostly unknown," the hipster's creator, Jean-Philippe Delhomme, a French artist, graphic designer and author, said in an interview.
They are mostly unknown — loved and hand-picked by a designer, yet abandoned or even thrown out after a change of leadership.
Many snake venom toxins are serine proteases but their specific in vivo targets are mostly unknown.
The mechanism and the type of hearing loss induced by cochlear implants are mostly unknown.
Molecular factors regulating the distinctive generation and establishment of skin-specific ILCs under homeostatic and inflammatory conditions are mostly unknown.
The shipping container's structural integrity, modification properties, foundation limits, building code regulations, and reinforcing limits are mostly unknown.
However, their ability to achieve no net loss is rarely evaluated, and factors leading to their success are mostly unknown.
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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