如果匹配不成功，它也会发出一个通知，告知请求中的主题为未知的主题。
If the match is unsuccessful, it issues a notification that the topic in the request is unknown.
如果银行员工批准申请，银行经理将收到通知，告知其对申请进行审批。
If the bank employee approves the application, a bank manager receives notification to review the application.
如果发生错误，应当通知用户并告知恢复方法。
If an error occurs, users should be notified and informed of ways to recover.
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