n.圓周；周圍；周長
He went jogging around the circumference of the reservoir every morning. 他每天早晨繞著水庫周圍慢跑。
This tree has a circumference of 6 feet. 這棵樹周長六英尺。
The circumference of the earth is almost 25,000 miles. 地球的圓周長約為兩萬五千英里。
