At present,much attention has been paid to the second digital divide by the academic circles in foreign countries,and much progress has been achieved in this field.

As the Internet moving beyond the diffusion process, researchers become more interested in the second-level digital divide, that is, the inequalities due to different purposes, users\' online skills, and Internet usage patterns (Hargittai, 2002), and online political participation, one of the most important topics concerning the role of the internet in promoting e-democracy.

The differences between English and Chinese have constituted obstacles for the translation from English to Chinese and vice versa,and also formed gaps between the two languages,cultures and ideologies.

And there is enormous wide gaps not only between nature and freedom but between cognition and morality.

Simply Analyze the Disadvantages on the Sustainable Development of the "Digital Divide;

The digital library construction under "Digital divide" vision;

Digital Gap and Imbalanced Cyber Development;

On how to bridge the digital gap between the advanced countries and China;

The Digital Gap Question on E-government Construction in China;

Review and research on "semantic gap" problem in the content based image retrieval;

One of the most challenging research issues in content-based image retrieval(CBIR) is how to bridge the significant semantic gap between the low-level image features and the high-level semantic concepts.

Because of the "semantic gap" which is often encountered in the image data,traditional CBIR technology can t deal with the problem of image retrieval in digital libraries sometimes.