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Discover LudwigSuggestions(5)
The phrase 'are the primary source' is correct and usable in written English.
You can use it when you are discussing the origin of a particular idea, phenomenon, or event. For example: "The early records of the city council are the primary source of information about the first settlers in the area."
Exact(60)
Coal-burning power plants are the primary source of the main chemical, nitrogen oxide.
Tax revenues from homeowners, industry and commercial enterprises are the primary source of that money.
On rocky planets like Earth and Mars, volcanic emissions are the primary source of atmospheric gases, including water vapor.
Fish are the primary source of protein for an estimated one billion people around the world.
The interest payments on those securities are the primary source of the Fed's profits.
The quotas paid by members of the IMF are the primary source of income for the organization.
Because birds are the primary source of West Nile, the states receiving the grants are mainly along the flyway of migratory birds along the Atlantic Seaboard.
Consumer Reports, a monthly, refuses to publish ads, which are the primary source of revenue for most magazines, yet it makes a healthy profit.
The CME speed and width are the primary source parameters.
Urban activities are the primary source of carbon emissions.
Computed Tomography (CT) images are the primary source to fabricate the medical models.
More suggestions(16)
are the primary revenue
are the primary origin
are the key source
are the primal source
are the basic source
are the predominant source
are the foremost source
present the primary source
address the primary source
are the primary causes
comprise the primary source
are the primary origins
are the leading source
are the primary results
are the primary bearer
are the primary malaria
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