最后一种状态通常表示该插件无法确定服务的状态。
The last state usually means that the plug-in was unable to determine the status of the service.
当这样一种状态（对 Generic Browser 容器而言指的是 Web 站点）与地标表示匹配时，容器组件就会触发某种事件。
When such a state (or Web site in terms of the Generic Browser container) has been matched by the landmark expression, the container component can fire certain events.
在该图中的各种状态中，每一种表示了该堆栈的一种配置。
The various states in the diagram each represent one configuration of the stack.
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