a group of people or organizations who have close links and protect and help each other rather than anyone outside the group

the close friends who form Paul's magic circle 保罗小圈子里的密友

a British organization for stage magicians (= people who perform magic tricks)

She's so good at optical illusions that the Magic Circle just made her its youngest member. 她非常擅视觉幻象，英国魔术协会刚刚吸纳她为最年轻的成员。