规范中没有该特性的部分原因是缺少用于引用 EJB 组件群的机制，例如，使用通配符的语言表达方式。

Part of the reason this feature is missing from the specification is the lack of a mechanism for referring to a group of EJB components, for example, through an expression language with wildcards.

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将一个群推往一个方向，将另一个群推往另一个方向，这需要一些最初的触发机制。

Some initial triggering mechanism is needed to push one group in one direction, and another in another direction.

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基于流行度：社会投票机制来定义对某一群体来说有趣的视频。

Popularity Based: social voting mechanism to identify the most interesting videos for a group of people.

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