情景：执行进程连接到资源管理器。

Scenario: the process of execution is connected to the resource manager.

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情景：资源管理器不可用时，启动一个PoE。

Scenario: Start a PoE when the resource manager is unavailable.

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情景：在执行使用资源管理器的事务时，资源管理器不可用。

Scenario: The resource manager becomes unavailable during the execution of a transaction that uses the resource manager.

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