: the correlation between the distribution and density of
then we look at the distribution of keywords. After expansion and keywords to determine the core keywords, we will get the relevant keywords dozens or even hundreds of. So, so many keywords, there would be more reasonable in what place "? We used to implement the main site of practice is mainly focused on the following areas: Title, meta," the title, text, pictures, "ALT notes at the bottom of the page text hyperlinks, which is associated with the industry website Links.