circumference
n
(a) line that marks out a circle or other curved figure1(2b) 周线; 周缘; 圆周. =>App 5 见附录5.
(b) distance round this 周长
The circumference of the earth is almost 25000 miles/The earth is almost 25000 miles in circumference. 地球的圆周长约为25000. =>illus at circle 见circle之插图. Cf 参看 perimeter.