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Discover LudwigSuggestions(5)
The phrase "a main source of" is correct and usable in written English.
It can be used to indicate a primary origin or contributor of something, such as information, resources, or influence.
Example: "The internet has become a main source of information for students conducting research."
Alternatives: "a primary source of" or "a key source of".
Exact(60)
A main source of friction has been taxes.
That would dampen a main source of consumer demand over the last two years.
By declining to offer fresh food, they eliminated a main source of waste.
Court appointments have long been a main source of patronage for the politically connected.
These days, however, a main source of irritability is an unlikely subject: the public library.
Agriculture is a main source of income for rural communities in many developing countries.
They provide multimillion-dollar subsidies that are a main source of Metro's funding.
A main source of uncertainty in traffic dynamics is heterogeneity among drivers.
A main source of strength in this war was the unity of our people.
The glucose found in food is a main source of energy.
Chinese hospitals have traditionally relied on drug sales as a main source of revenue.
More suggestions(18)
a fundamental source of
a prominent source of
a great source of
a basic source of
a substantial source of
a main origin of
a mainstream source of
a core source of
a main sources of
a primary source for
a major sources of
a main cause for
a main characteristic of
a major source of
a primary source of
a main proponent of
a main component of
a main dish of
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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