The phrase "a primary area" is correct and usable in written English.
It can be used to refer to a main or significant region or field of interest, focus, or activity.
Example: "The research team identified a primary area of study that would yield the most impactful results."
Alternatives: "a main focus" or "a key sector".
I chose clinical research as a primary area of focus.
In a recent Federal Highway Administration study, congestion measurement was a primary area of emphasis.
Building a better video platform has become a top priority, she said at the time, adding that video would be a "primary area of investment over the next year".
Following the earthquake of February 22 , 1880 Milne's attention turned to seismology as a primary area of study.
Depending on the policies of the incoming administration, the urban-rural gap for LGBTQ youth may emerge as a primary area of concern.
The D.A. recently acknowledged to the Sacramento Bee that he realized the initiative would reduce DNA collections, but this was "not a primary area of concern".
To examine, through the analysis of the prescriptions billed during 2001, the brands of generic medicine prescribed by family doctors at 6 health centres in a primary care area.
The risk for selection bias is low since this study is based on a large sample from a primary care area serving 97% of the population.
We could not find any study that assesses this issue at the level of a primary care area and its different health centers in the long run.
On the basis of current evidence from archeology, mitochondrial DNA, and Y-chromosomal sequencing, a number of different domestication scenarios have been proposed, ranging from the spread of domestic horses out of a restricted primary area of domestication to the domestication of numerous distinct wild horse populations.
(Eastern Europe) (We would like assistance with an) overall communication strategy, for example including national institutions and organizations related to public health, sport, etc. (Eastern Europe) A final primary area of desired support related to the negotiation and management of relationships with public and private organizations.
