表示一个回调，该回调用于向事务管理器指示事务的状态不确定。
Represents a callback that is used to indicate to the transaction manager that the status of the transaction is in doubt.
表示一个回调，该回调用于向事务管理器指示事务的状态不确定。
Represents a callback that is used to indicate to the transaction manager that the status of the transaction is in doubt.
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