circumferenceKK [ˏsɝˋkʌmfrəns] /ˌsɝˈkʌmfɹəns/發音circum 圓、環繞+fer 帶、拿+-ence 名詞→環繞著帶過去展開收合circum字根圓、環繞fer字根帶、拿-ence字尾名詞字面:環繞著帶過去沿著圓形繞一圈所經過的線 → 圓周、周長。名詞1圓周長、周長To find the circumference of a circle, multiply the diameter by pi.要求圓的周長,把直徑乘以圓周率即可。2周圍、外圍A narrow path runs around the circumference of the lake.湖的周圍有一條狹窄的小徑。3圍長、粗細The old tree measures nearly six meters in circumference.這棵老樹的樹圍將近六公尺。