The phrase "a sphere of activity" is correct and usable in written English.
It can be used to describe a specific area or domain in which activities or operations take place.
Example: "The organization focuses on environmental conservation, making it a prominent sphere of activity for volunteers and activists."
Alternatives: "a field of activity" or "an area of engagement".
Equally important is mastery of a particular domain that is, a sphere of activity or knowledge that requires a high level of ability.
It is a sphere of activity that American entrepreneurs could use as a springboard to a new decade of productivity, prosperity and self-preservation technology to addreself-preservation technologyological crisis.
And then you find you can't go back from that, even if you discover that this is horribly flawed; once you completely rebuild a sphere of activity around computers, it often becomes impossible to back up and to re-insert a human being in that process.
Nevertheless, if there is one major team that could make a Horlicks of an apparently simple qualification, it is France, whose group stage flops in 2002 and 2010 were among the most inept campaigns by any organisation in any sphere of activity, sporting or otherwise.
How and why did it happen that a sphere of cultural activity was transformed from a craft to an art?
Prodigy, a child who, by about age 10, performs at the level of a highly trained adult in a particular sphere of activity or knowledge.
Gifted child, any child who is naturally endowed with a high degree of general mental ability or extraordinary ability in a specific sphere of activity or knowledge.
Teachers in the compared groups may have attached slightly different meanings to the questionnaire items, some of them taking stock of all elements of their professional practice, others referring to a selected sphere of activity.
During the book tour for the novel, Gibson elaborated on this theme, proposing that the ubiquity of connectivity meant that what had been called "cyberspace" is no longer a discrete sphere of activity separate from and secondary to normal human activity, but that those increasingly less common parts of normal life free from connectivity were the exception.
The introduction of laser scanning and computer-aided tomography has opened up a new sphere of activity in dental imaging and measurement.
Within the current trend of establishing New Public Management in health care in developing countries [ 1] and the Paris Declaration on Aid Effectiveness [ 2], programme evaluation will become a major sphere of activity for the coming decade.
