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The phrase "are a direct cause" is correct and usable in written English.
It can be used when discussing the relationship between two events or factors, indicating that one is responsible for the occurrence of the other.
Example: "The increase in pollution levels are a direct cause of the decline in local wildlife populations."
Alternatives: "are a primary factor" or "are a significant contributor".
Exact(3)
It has been highlighted that these unique features are a direct cause of the quantum size effects of the silicon nano-crystallites.
In Plantinga's example of Sylvia, for instance, the person's belief that their leg hurts is based only on the pain felt in their leg for, on McCain's theory, neither the becoming rattled nor the belief that the person sees Sylvia are a direct cause of the belief that their leg hurts.
The other interpretation is that higher RRs are a direct cause of increased GC content.
Similar(57)
The directional effect is a direct cause of the severe anisotropy in the mechanical properties of the fabricated part.
While early pregnancy might rarely be a direct cause of maternal death, unsafe abortion most certainly is.
It has stopped banks from lending to "job creators," they contend, and is a direct cause of high unemployment.
Further research is needed, however, to confirm whether the lack of neurons is a direct cause of autism, or is merely a consequence of it.
Home Office pathologist John Clark said it was unlikely that a head injury suffered during a fight earlier was a direct cause of death.
Now even had the San Francisco 49ers won Super Bowl 47, the idea that the blackout was a direct cause of their second half success seems a little ludicrous.
The number of passengers appears not to have been a direct cause of the crash, but obviously contributed to the high death toll.
A seed, for example, is a direct cause of a plant, while sunshine, water, and earth are auxiliary causes of a plant.
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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