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The phrase "a key source of concern" is correct and usable in written English.
You can use it when discussing an important issue or problem that is causing worry or anxiety.
Example: "The rising levels of pollution in the city have become a key source of concern for residents and environmentalists alike."
Alternatives: "a major cause for concern" or "a significant issue of worry."
Similar(60)
But he said the "key source of concern" for the medical team looking after her was an infection in the path traveled by the bullet.
But the government has no power to limit EU immigration, which has been the key source of concern in recent years.
[There is] some infection in the bullet track, which is our key source of concern," he told reporters.
Labor unions -- a supposedly liberal concern, and certainly a key source of campaign cash for Democrats -- obviously benefit, but so do businesses both big and small, a slice of America that is supposedly part of the conservative core.
"They are a key source of demand for new development".
Work is also a key source of status and identity.
Families are a key source of capital, contacts and customers.
Akin also apparently lost a key source of funding.
It would be a key source of the very definition of life.
Take managers of hedge funds, a key source of donations to candidate Obama in 2008.
The first was to change taxation rules to permit venture capital, a key source of financing.
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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