The phrase "area which is primarily" is correct and usable in written English.
It can be used to describe a specific region or field that has a dominant characteristic or focus.
Example: "The area which is primarily known for its agricultural production has seen significant growth in recent years."
Alternatives: "region that is mainly" or "field that is predominantly".
The occurrence of 18 commonly used pharmaceuticals was investigated in an agricultural area, which is primarily affected by runoff from agricultural fields and septic systems, on the coastline of Maumee Bay, within the western Lake Erie basin.
In 1978 and 1979, Tanzania and Uganda were at war in the Kagera area, which is primarily pastoralist rangeland.
Portions of the Walla Walla Valley AVA, an area which is primarily in Washington (along with the Columbia Valley AVA which contains it), descend into Oregon in the Milton-Freewater area.
The first level ecoregion was composed of three watersheds (a part of the Yellow River, Xiaoqing River and Tuhaimajia River) plus the urban area, which was primarily determined on the basis of the city administrative divisions and river watersheds.
Most of the responding offices were the principal office for the area, which was primarily at the county or parish level.
In addition to size, the accessibility of the surface area is of importance, which is primarily affected by porosity.
At the hospital level, there are two public referral centres: Basurto Hospital, the main hospital in the area, and Santa Marina Hospital, which is primarily focused on chronic diseases and palliative care.
In Lancaster, California, which is primarily a Republican area in north Los Angeles County, there's a new plant there.
However, 30 minutes after protein addition, the number of lo-phase domains per monolayer area has increased from (330±70) mm−2 to (750±290) mm−2, which is primarily a result of an increase in the number of small domains (<1000 µm2) from 72% to 94% of all lo-phase domains.
Optimization of protein yield, which is primarily determined by protein expression levels, is a very important cost-saving area.
