什么是 circle?A plane curve everywhere equidistant from a given fixed point, the center.A planar region bounded by a circle.Something, such as a ring, shaped like such a plane curve.A circular course, circuit, or orbit: a satellite's circle around the earth. A traffic circle.A curved section or tier of seats in a theater.A series or process that finishes at its starting point or continuously repeats itself; a cycle.A group of people sharing an interest, activity, or achievement: well-known in artistic circles. A territorial or administrative division, especially of a province, in some European countries.A sphere of influence or interest; domain.Logic A vicious circle.To make or form a circle around; enclose. See Synonyms at surround.To move in a circle around.To move in a circle. See Synonyms at turn.circle the wagons To take a defensive position; become defensive.