由流程引擎用于向集群发送消息。
It is used by the process engine to send messages to the cluster.
你可以群发同一条请求，或者针对不同读者分别发送请求。
You can either broadcast a standard request or send personalized requests separately.
你可以群发同一条请求，或者针对不同读者分别发送请求。
You can either broadcast a standard request or send personalized requests separately.
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