Services provided by the 1 allow users to access huge amount of 2 such as text, graphics, sound and software over the Internet. The most 3 and widespread Internet application services include WWW, File Transfer 4 , E-mail and telecommunication 5 . 互联网提供的服务允许用户通过互联网访问大量的信息,如文本、图形、声音和软件。最流行和最广泛的互联网应用服务包括WWW、文件传输协议、电子邮件和电信网络。