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The phrase "are a main source of" is correct and usable in written English.
It can be used when discussing the primary origin or contributor of something, such as information, resources, or energy.
Example: "Renewable energy sources, such as solar and wind, are a main source of sustainable power for the future."
Alternatives: "are a primary source of" or "constitute a key source of".
Exact(32)
Good computer systems are a main source of a bank's competitive strength, so doing a decent job of combining systems is crucial.
A global recovery from the financial crisis and rising stock markets have lifted the outlook for life insurers, for which investment returns are a main source of income.
While on the bench, records show, Michael and Gerald Garson have regularly done what many of their counterparts have done for years: dispensed any number of the appointments and receiverships that are a main source of extra income for many lawyers to a core group who have been major powers within the Brooklyn Democratic Party.
Although the new charter preserves an article from the old constitution declaring that the principles of Islamic law are a main source of legislation, it adds a new article, No. 219, which broadly defines those principles as the established schools of Sunni Muslim scholarship.
Alkalinity is related to the hardness, because carbonate rocks are a main source of alkalinity.
Ergonomic requirements are a main source of semi-similarity in size ranges.
Similar(28)
These are a main sources of storage and propagation of the bacterium, which is spread through minuscule water droplets.
Court appointments have long been a main source of patronage for the politically connected.
The draft constitution states that Islam will be "a main source" of law, and some Shiites prefer a secular government.
Cattle is a main source of income for large farms, and sheep and the breeding of racehorses are also important.
In fact, if there is a main source of disgruntlement on Nevis, it is probably St Kitts.
More suggestions(17)
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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