信任与不信任（Trust v No-trust）
The Google Tolerance line will be in a different place depending on the site that is being ranked. For a site that has proven its worth and Google trusts a lot, we might see the diagram like this:
A Trusted Site
Yet for a new site, and one that has no track record to speak of, the diagram will probably look a lot more like this.
A Non-Trusted Site
The only difference is in the location of the dashed “tolerance line”.
In other words, Google are a lot more tolerant to sites that have built up authority and trust than they are to new sites or sites that have not been able to attain a decent level of authority.
A high authority site with lots of trust can withstand a certain amount of spammy SEO without incurring a penalty (see later when we discuss “negative SEO”). The more authority, the more it can withstand.
A new site on the other hand, would be quickly penalized for even a small amount of spammy SEO.