原文参考:1、http://wenku.baidu.com/link?url=u3yOOZ7stInwPwgHR698sJxY0gVbSwahmpzK08P3r6eJkS5-bOOiJr6X1TnhqlgV8C6wNoYt1SSESP1FFN0XcnJrALCLmJ9WDr6ERAe4Dua; 2、http://wenku.baidu.com/view/7930b18dcc22bcd126ff0cd9.html