在假设因果图中的连接事件表示必然因果关系条件下，因果图可以转换为含有可能的因果关系的故障树。

Supposing that connecting event in causality express necessary causality, causality diagram can be converted into fault tree including possible causality.

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信号除了将对象相互连接之外，与事件非常相似。

Signals are a lot like events, except that they connect objects to one another.

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另外，这两个协议都能够建立长连接，事件可以通过长连接异步地递送给应用。

In addition, both can set up long-running connections such that events can be delivered asynchronously subsequently to the application.

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