The phrase "are frequently centred" is correct and usable in written English.
It can be used to describe something that is often focused or concentrated around a particular point or theme.
Example: "The discussions in the meeting are frequently centred on improving team collaboration and communication."
Alternatives: "are often focused" or "are commonly centered".
White shark populations are frequently centred in highly productive temperate coastal waters (that is, waters characterized by an abundance of fishes and marine mammals), such as off the coasts of the northeastern and western United States, Chile, northern Japan, southern Australia, New Zealand, southern Africa, and the Mediterranean.
At larger calderas (> 10 km diameter) deformation is frequently centred on caldera rims and extends beyond their topographic boundaries.
Whenever literacy, the joys of reading, and the need to inspire children with a lifelong love of books are discussed, story and character are frequently found centre-stage.
Assessment centres are frequently mentioned.What type of jobs are these used for?
Women living outside metropolitan and regional centres are frequently under-represented in research studies.
Some of them say that health centres are frequently too crowded and that they have to wait 5 or 6 hours.
We designed a study, which surveyed the knowledge, attitudes and practices of clinicians in a secondary referral centre who are frequently treating OP poisoning.
(Transformations required for centre manifold reductions are frequently of this type).
Specialised research centres have emerged as an important organisational solution, yet centre productivity and sustainability are frequently dictated by the availability and security of infrastructure funds.
Travel and transport are frequently cited as barriers to uptake of centre-based programs.
But the Centre for Public Policy for Regions (CPPR) at Strathclyde University warned that those figures – which are frequently repeated by the Yes Scotland pro-independence campaign – were misleading.
