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Discover Ludwig"been improved" is a correct and usable phrase in written English.
It is a past participle form of the verb “improve” and is usually used in the passive voice to describe a situation in which the object of the sentence has been acted upon (improved) by someone or something else. For example: The company’s sustainability practices have been improved over the past five years.
Dictionary
been improved
verb
To make (something) better; to increase the value or productivity (of something).
Exact(59)
"It's been improved.
The technology has been improved.
Wireless access has been improved.
The asylum system has been improved.
Mandatory financial counseling has been improved.
The sewage system has also been improved.
It couldn't have been improved.
How could the interaction have been improved?
Routes leading into Croatia have been improved.
Emergency response has been improved.
Similar(1)
These had been improving.
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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