说明：  到底什么是CGI。Common Gate Intergace听起来让人有些专业，我们就管它叫CGI好了。在物理上，CGI是一段程序，它运行在Server上，提供同客户段 Html页面的接口。
(What is in the end CGI. Common Gate Intergace sounds like some professional people, we better call it CGI. In physics, CGI is a program that runs on Server to provide customers with the above interface Html page.)