例句：
1.具有围长g的连通图的周长。
Circumference of Connected Graph with Girth g.
2.ISO薄壁轴瓦半圆周长检验模CAD程序系统
A CAD Programming System for ISO Thin-Wall Bearing Semicircular Perimeter Checkout Model.
3.基于FFT的区域周长的快速算法。
A Fast Algorithm Based on FFT for Calculating Perimeter of Region.
4.这个形状奇特的美丽湖泊周长约有15,000英尺。
This beautiful and curiously shaped lake lies at around fifteen thousand feet.
5.这个岛周长3.5千米。
The island is 3.5 km in circumference.