在浏览器中看起来很好的页面却可能阻碍爬行器，这会使爬行器看不到或误解整个页面或部分页面。
Pages that seem fine in a browser can trip up a spider, which loses or misinterprets part or all of your page.
在所有主流浏览器上不断出现同一设计风格(顶部分页栏、统一地址栏)的原因在于：从易用性出发。
The reason these same design themes (top-tabs, unified URL bar) keep showing up in all the browsers is that they just make sense from a usability standpoint.
Ajax通过在服务器中检索部分页面和刷新浏览器以实现高交互性。
Ajax achieves high interactivity through only partial page retrieval from a server and refresh in a browser.
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