单词：circumferences
音标：[səˈkʌmfərənsiz] ；
n. 周围, 圆周( circumference的复数形式 )
n. the size of something as given by the distance around it
n. the boundary line encompassing an area or object
n. the length of the closed curve of a circle
n. the boundary line encompassing an area or object
n. the length of the closed curve of a circle