I'll explain those that relate to my sphere of activity.
Military operations were a specialized and limited sphere of human activity.
We are proposing a complex system, with public and private spheres of economic activity.
There was one sphere of human activity the computers hadn't taken over!
Each circuit is concerned with a different sphere of activity.
Everybody who comes within the Others' sphere of activity has thoughts like that.
There was a revolution in almost every sphere of human activity.
Each marked a known location within the woman's sphere of activity.
In other words, a very wide sphere of activity must be included.
At the same time, there is the difficulty that so many different spheres of activity are involved.