名詞 circumference:

1. the size of something as given by the distance around it
   同義詞：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.
   圓滾線，擺線圓周上任一點(diǎn)在一條直線上滾動時(shí)所形成的曲線
2. The distance around something; the circumference.
   周圍，四周圍繞某物的距離; 周圍
3. The circumference of the earth is almost 25,000 miles.
   地球的圓周長約為兩萬五千英里。

cir.cum.fer.ence

n.Abbr. cir,circ.,circum.（名詞）縮寫 cir,circ.,circum.
The boundary line of a circle.
圓周：一個(gè)圓的邊界線

The boundary line of a figure, area, or object.
周圍：一個(gè)圖形、區(qū)域或物體的邊界線
The length of such a boundary.
周長：這種邊界的長度

來源：
Middle English
中古英語
from Old French circonference
源自 古法語 circonference
from Latin circumferentia
源自 拉丁語 circumferentia
from circumferôns circumferent- [present participle of] circumferre [to carry around]
源自 circumferôns circumferent- [] circumferre的現(xiàn)在分詞 [達(dá)到]
circum- [circum-]
circum- [環(huán)繞]
ferre [to carry] * see bher-
ferre [達(dá)到] *參見 bher-

【引伸】
circum.feren.tial
<參考詞匯><同義詞>circumference,circuit,compass,perimeter,peripheryThe central meaning shared by these nouns is .a line around a closed figure or area.:
這些名詞所共有的中心意義是.包圍著一個(gè)封閉圖形或區(qū)域的線.：
例句：
the circumference of the earth;
地球的周邊；

例句：
a park five acres in circuit;
一個(gè)占地五英畝的公園；

例句：
stayed within the compass of the schoolyard;
停留在校園的范圍內(nèi)；

例句：
the perimeter of a rectangle;
一個(gè)矩形的周長；

例句：
erected a fence around the periphery of the property.
在地產(chǎn)周圍豎起圍墻