circumference

名词 circumference:

1. the size of something as given by the distance around it
   同义词：perimeter
2. the boundary line encompassing an area or object
3. the length of the closed curve of a circle

1. The curve traced by a point on the circumference of a circle that rolls on a straight line.
   圆滚线，摆线圆周上任一点在一条直线上滚动时所形成的曲线
2. The distance around something; the circumference.
   周围，四周围绕某物的距离; 周围
3. The circumference of the earth is almost 25,000 miles.
   地球的圆周长约为两万五千英里。

cir.cum.fer.ence

n.Abbr. cir,circ.,circum.（名词）缩写 cir,circ.,circum.
The boundary line of a circle.
圆周：一个圆的边界线

The boundary line of a figure, area, or object.
周围：一个图形、区域或物体的边界线
The length of such a boundary.
周长：这种边界的长度

来源：
Middle English
中古英语
from Old French circonference
源自 古法语 circonference
from Latin circumferentia
源自 拉丁语 circumferentia
from circumferôns circumferent- [present participle of] circumferre [to carry around]
源自 circumferôns circumferent- [] circumferre的现在分词 [达到]
circum- [circum-]
circum- [环绕]
ferre [to carry] * see bher-
ferre [达到] *参见 bher-

【引伸】
circum.feren.tial
<参考词汇><同义词>circumference,circuit,compass,perimeter,peripheryThe central meaning shared by these nouns is .a line around a closed figure or area.:
这些名词所共有的中心意义是.包围着一个封闭图形或区域的线.：
例句：
the circumference of the earth;
地球的周边；

例句：
a park five acres in circuit;
一个占地五英亩的公园；

例句：
stayed within the compass of the schoolyard;
停留在校园的范围内；

例句：
the perimeter of a rectangle;
一个矩形的周长；

例句：
erected a fence around the periphery of the property.
在地产周围竖起围墙