External links quantity and speed of the link
 

External links is very important, but in release links to pay attention, new and old station link building early period, middle period, the number of later link building is not the same, after the establishment of new railway station, due to imperfect contents, link number don't need too much, the growth rate is also slowly growth, in the search engine's eyes, a new sites, impossible in a short period of time for a lot of links