Coordination Context 协调上下文
The subordinator coordinator registers with the coordinator specified on the received coordination context.
下级协调器在接收到的协调上下文中向所指定的协调器注册。
Be aware that the transaction coordination context is part of each message, even messages between applications and messages from applications to the database service.
需要注意得是，任何消息都包含事务协调上下文，不管是应用程序间的消息还是应用程序发送给数据库的消息。
A coordination context can be considered as an identifier under which activities are performed.
协调上下文可以被看作是一个标识符，行为执行在这个标识符之下。
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