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Discover Ludwig'has varied' is perfectly correct and usable in written English.
You can use it when you want to describe how something has changed or is different from what it was in the past. For example, "The average lifespan of a turtle has varied significantly over the past century."
Exact(58)
The methodology has varied.
That has varied.
This has varied enormously in the past.
The immediate impact, however, has varied.
The mode of burial has varied greatly.
Its effectiveness in those situations has varied.
Likewise the American policy has varied, too.
But the degree of suffering has varied.
The standard of male dancing has varied.
The response by school authorities has varied.
The reported death toll has varied widely.
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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