/sfɪr/
an area of activity, influence or interest; a particular section of society 范围；领域；阶层；界 SYN domain
the political sphere
政界
This area was formerly within the sphere of influence of the US.
这一地区先前属于美国的势力范围。
He and I moved in totally different social spheres.
我和他进入了完全不同的社会圈子。