- 1圓周、周長（數學課常說圓周長）
The distance all the way around the outside of a circle — or of anything round enough that “around” still makes sense: a plate, a tree trunk, a ball, a person’s waist. In maths it is a careful measurement, often written with the letter C, and it is not the same as the line that cuts straight across (that is the diameter) or the line from the centre to the edge (the radius). In ordinary talk people stretch it a little: they say “the circumference of the lake” even when the lake is not a perfect circle; they just mean how far it is if you walk the shore all the way around. Dictionaries also list a verb, to circumference something, meaning to go around it, but almost nobody uses that verb. People say go around, circle, or walk the edge instead. The noun is the word you will actually meet.
From the word’s history
From Latin circumferentia, from circum 'around' + ferō 'to carry'.
源自拉丁文 circumferentia：circum「周圍」加 ferō「帶」
組成From Latin circumferentia: circum (“around”) + ferō (“to carry”) — literally “a carrying around.” It took the place of Old English ymbgang.
同家族的字
- circumnavigatesame circum- “around”
- circumspectsame circum- “around”
- circuitsame idea of going around, from related Latin
原始詞典資料5 筆記錄
以下是外部詞典記錄的用法，摘錄並精簡格式，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
circumferencenoun/sɜːˈkʌmfɹəns/
- 1
geometrymathematicssciencesThe line that bounds a circle or other two-dimensional figure.
- 2
geometrymathematicssciencesThe length of such a line.
- 3
obsoleteThe surface of a round or spherical object.
- 4
graph-theorymathematicssciencesThe length of the longest cycle of a graph.
circumferenceverb/sɜːˈkʌmfɹəns/
- 1
obsoleteTo include in a circular space; to bound.
- Nor is the vigour of this great body included only in itself, or circumferenced by its surface
摘錄自 英文維基詞典 English Wiktionary，已精簡格式；依 CC BY-SA 4.0 授權使用，改動後的內容同樣以此授權提供。