根據這篇文章寫一篇文章:"從一塊寬1英寸,高1英寸,長4英寸的軟木 (松木,<unk>木或<unk>木) 開始. 用<unk>筆在木頭上畫出如圖所示的線條. 在輪<unk>球的兩側有<unk>洞. 轉過塊,然後重複. 切斷塊的兩端的碎片. 仔細切割球片,直到它可以在框架內自由滾動.  條款:
值得注意的是, 圓圈與邊緣線略有重疊. 你所做的就是從外面向內切割,直到只剩下一塊在中間,如圖所示. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/5\/55\/Whittle-a-Ball-in-a-Cage-Step-4Bullet1.jpg\/v4-460px-Whittle-a-Ball-in-a-Cage-Step-4Bullet1.jpg","bigUrl":"\/images\/thumb\/5\/5\/Whittle-a-Ball-in-a-Cage-Step-4Bullet1.jpg\/aid\/42434-v4-728px-Whittle-a-Ball-in-a-Cage-Step-4Bullet1.jpg","smallthumb"\",smallthumb"\/www.wikihow.com\/images\/thumb\/5\/5\/5\/5\/5\/Whittle-a-Ball-a-Ball-