A plane surface bounded by a single curved line called its circumference, every part of which is equally distant from a point within it, called the center; also, the closed plane curve bounding such a surface.

圆周；圆圈。

The orbit of a heavenly.

(天体运行的)轨道。

A number of persons or things united by a common bond.

群；集；界；派。

Something circular, as a group of seats in a theater.

圆形场；环状物(如戏院中环列的座位)。

Completed series or course of operations; cycle.

循环；周期。

Area, scope, as of influence.

(影响所及的)区域；范围。

Fallacy of proving a first proposition by a second which itself rests upon the first for; proof.

【逻】循环论证。

To revolve.

回旋；旋转。

To surround.

环绕；包围。