Yesterday in listening to AdSense a network meeting, the presenter mentioned a raise AdSense ads related to the skills, for those who feel the advertising matching degree is not high, ads low clicks of AdSense users reference to use.
Google adsense ads usually for users of the content of the page automatically display ads, but AdSense may not know which departments on your Web page content more important, if the user by manually adding some HTML code, highlighting or ignoring some parts of the page, This to a certain extent can guide AdSense crawler focus on the analysis of some parts of the page or ignore some parts, to improve the relevance of the ads.
For example, if you want to emphasize a part of a page, you can add the following two HTML code before and after this department.
<!--Google_ad_section_start-->
<!--google_ad_section_end-->
Place the parts you need to emphasize between these two pieces of code.
If the user wants to ignore the information that started somewhere, add the following HTML code before that location.
<!--Google_ad_section_start (Weight=ignore)-->
After these processing, AdSense ads will get a certain degree of relevance.
However, if the user page content is not enough, then there may be because there is no advertising content to display public service ads.