circumference

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The distance around something; the circumference.
周围，四周围绕某物的距离；周围
he calculated the circumference of the circle.
捷诺用手在桌上画了大小两个圆圈,。
The lake is twenty miles in circumference.
这湖周围二十哩。
That point falls on the circumference of the circle.
那一个点落在这圆的圆周线上。
The diameter and the circumference of a circle correlate.
圆的直径与圆周有相互关系。
ratio of the circumference of a circle to the diameter
圆周率
A circle whose circumference rolls along the circumference of a fixed circle, thereby generating an epicycloid or a hypocycloid.
周转圆一个围绕着另一个固定圆周长滚动的圆，从而产生圆外旋轮线或圆内旋轮线，即外摆线或内摆线
The earth's circumference is more than 40000 kilometres.
地球的周长为四万多公里。
the ratio of the circumference to the diameter of a circle.
圆周长度与圆的直径长度的比。
A circular arc of90=; one fourth of the circumference of a circle.
九十度弧；圆周的四分之一

专业解释：数学物理化学生物环境信息工程健康地球交通其他
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