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Discover LudwigSuggestions(5)
"have long observed" is correct and usable in written English.
You can use it when you are trying to emphasize that something has been noticed or studied over an extended period of time. For example: "Scientists have long observed the effects of global warming on coral reefs in the ocean."
Exact(58)
YORKSHIREMEN have long observed that where there's muck there's brass.
Budget watchdogs have long observed that election year budgets are different from all other budgets.
Physics Students have long observed the science of motion by sending miniature carts trundling down inclines.
Aren't they cute?" Psychologists have long observed the importance given to the face.
Biologists have long observed that some sea creatures glow in the dark.
Scientists have long observed that women tend to be pickier than men when choosing a mate.
Ecologists have long observed that consumers can maintain species diversity in communities of their prey.
But music fans have long observed the similarities between the two songs.
Sociologists and other scholars have long observed Wall Street's humor, much of it crude.
Similar(2)
Commentators have long-observed variation in how shrinkage is conceived and measured (see Beck 2006, 2016a).
And Kenyans and expats alike have long observed until yesterday, often enough with a laugh that with its worldly crowd and lax security, Westgate is also an ideal target for terrorists.
Write better and faster with AI suggestions while staying true to your unique style.
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