並前往http://md1.mdhs.tc.edu.tw/tp/teacher/TE229/%E7%8F%AD%E7%B4%9A%E7%B6%93%E7%87%9F/ch5-3%E7%BE%8E%E7%9A%84%E5%BD%A2%E5%BC%8F%E5%8E%9F%E7%90%86NEW.ppt