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Discover LudwigThe phrase "are threefold" is correct and can be used in written English.
It means that something exists in three parts or forms. Example: "The benefits of exercise are threefold - physical, mental, and emotional."
Dictionary
are threefold
adjective
Three times as great
Exact(59)
Miami's difficulties are threefold.
My points are threefold.
Their goals are threefold.
The potential solutions are threefold.
The potential problems are threefold.
But the shivers here are threefold.
So the questions arising are threefold.
The reasons for this are threefold.
Earnings from poppies are threefold those from wheat.
Our contributions are threefold.
The conclusions are threefold.
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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