当请求一个SSL 保护的页面时，浏览器认为服务器是一个可信任的实体，并且启用一个连接来回传递加密的信息。
When an SSL-protected page is requested, the browser identifies the server as a trusted entity and initiates a handshake to pass encryption key information back and forth.
地址就是IP地址，并且当usr3请求一个可信任的连接时，请求就被接受，因为usr3满足所有连接属性。
The address is the IP address, and when usr3 requests a trusted connection, the request is accepted, because usr3 satisfies all the connection attributes.
反过来讲，当搜索引擎要判断网页的关键词时，图片的ALT -代替属性是一个可信任的参考点。
Conversely, when the search engine key words to determine the page, the picture instead of ALT-attribute is a trusted reference point.
反过来讲，当搜索引擎要判断网页的关键词时，图片的ALT -代替属性是一个可信任的参考点。
Conversely, when the search engine key words to determine the page, the picture instead of ALT-attribute is a trusted reference point.
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