並前往http://www.khgs.tn.edu.tw/books/%E9%BE%8D%E9%A8%B0%E6%96%87%E5%8C%96/%E9%AB%98%E8%81%B7%E6%95%B8%E5%AD%B8/B(I)%E9%99%B3%E7%89%88/CH2/%E4%BE%8B%E9%A1%8C/p41a3/
