The phrase "a certain regional" is correct and usable in written English.
It can be used when referring to a specific region or locality without naming it directly, often to imply some characteristics or features associated with that region.
Example: "The festival celebrates a certain regional tradition that has been passed down through generations."
Alternatives: "a specific area" or "a particular region".
Biogas is considered useful to create and keep value in a certain region, but if regional use is not possible, green gas becomes more attractive and useful.
However to incorporate it as an index, certain regional parameters and research studies that employ rigorous research methodologies need to be done.
In the world view Rubio outlined Wednesday, which he billed as a new doctrine, certain regional conflicts that look very difficult – the ongoing war in Syria, the failed state of Libya – in fact began as tractable problems that spun out of control due to tragic US negligence.
At the same time, he said, the government will most likely face fewer obstacles because of "a will from the military and certain regional powers".
To a certain extent, regional segregation is replacing the rural urban divide to become the main facet of labor market segmentation in China (Zhang 2007).
Certain regional leaders will serve on a management board reporting to Mr. de Guzman.
When preliminary results were published Monday, it appeared that Mr. Bakiyev's party, Ak Zhol, had won all the seats under the complex election rules, which included requirements that a party win at least 5percentt of the total vote and cross certain regional thresholds to be eligible for any seats in Parliament.
Wind resource has certain regional feature which means different positions has varies values in a wind farm.
Airlines typically need to charge 10 to 12 cents a mile to break even, and some discount fares available in recent days on certain regional routes are selling at one-fifth the airline's costs, he said.
