例句：

　　1.具有圍長g的連通圖的周長。

　　Circumference of Connected Graph with Girth g.

　　2.ISO薄壁軸瓦半圓周長檢驗模CAD程序系統

　　A CAD Programming System for ISO Thin-Wall Bearing Semicircular Perimeter Checkout Model.

　　3.基于FFT的區域周長的快速算法。

　　A Fast Algorithm Based on FFT for Calculating Perimeter of Region.

　　4.這個形狀奇特的美麗湖泊周長約有15,000英尺。

　　This beautiful and curiously shaped lake lies at around fifteen thousand feet.

　　5.這個島周長3.5千米。

　　The island is 3.5 km in circumference.