並前往http://ftp//webhd.ltsh.ilc.edu.tw/Download/@Recycle/Software/www8/%E5%AE%98%E8%80%81%E5%B8%AB%E7%9A%84%E7%B6%B2%E9%A0%81/longlife/GGB_Classroom/Unit_7/Protractor-02.html