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"is the primary cause" is a grammatically correct phrase that can be used in written English.
It is typically used to indicate that something is the main or most important reason for a certain outcome or situation. Example: The increase in pollution levels is the primary cause of the decline in air quality in the city.
Exact(60)
Income inequality is the primary cause; people simply can't afford to risk new experiences.
Needless to say, carbon pollution is the primary cause of dangerous global warming.
Noted author on how hemodynamics, and not cholesterol or diet, is the primary cause of atherosclerosic heart disease.
Analysts believe that the bleak economic outlook is the primary cause for the dip in oil prices.
The second argument is broader, arguing that the financial sector is the primary cause of the current crisis.
It is less certain whether stress is the primary cause of the increase in acne in adult women.
The utter failure of Mr. Arafat to live up to that assumption is the primary cause of our crisis today.
Human factor is the primary cause of traffic accidents.
For GE-AgNPs, n-type doping is the primary cause and the secondary is tensile strain.
Wear is the primary cause of failure of joint replacement prostheses.
What is the primary cause for the high underpricing of a national IPO?
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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