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Discover LudwigSuggestions(5)
The phrase "are an important source" is correct and usable in written English.
You can use it when discussing the significance or value of a particular entity or factor in providing information, resources, or support.
Example: "Books and articles are an important source of knowledge for students."
Alternatives: "serve as a vital resource" or "constitute a key source".
Exact(60)
Research grants are an important source of income for many.
But for others they are an important source of income.
Beans are an important source of plant-based protein.
Conifers are an important source of commercial timber.
Soils are an important source and sink for carbon.
Naturally fractured reservoirs are an important source of hydrocarbons.
Sheep are an important source of meat in Kenya.
Keratin wastes are an important source of renewable raw material.
Construction projects are an important source of organizational knowledge.
Small, independent presses are an important source for a greater variety of voices and perspectives.
These volunteers are an important source of information about the whereabouts of refugee families.
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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