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The phrase "a main source of progress" is correct and usable in written English.
You can use it when discussing factors or elements that contribute significantly to advancement or development in a particular area.
Example: "Investing in renewable energy has become a main source of progress in combating climate change."
Alternatives: "a key driver of progress" or "a primary contributor to progress."
Exact(1)
MOSFET gate length scaling has been a main source of progress in digital electronics for decades.
Similar(59)
A main source of friction has been taxes.
These days, however, a main source of irritability is an unlikely subject: the public library.
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.
And European interest in acquisitions in the United States, a main source of capital inflow, is diminishing.
- Makki in 2002 frequently visited the Middle East and viewed it as a main source of funding.
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 strength in this war was the unity of our people.
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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