Subscribers define the filter criteria for a subscription, which determines which registry changes will be tracked for the subscriber.
订阅者为订阅定义过滤标准，过滤标准确定将为订阅者跟踪哪些注册中心变化。
Subscription filter allows subscriber to define a list of topics that a notification consumer is interested in.
订阅筛选器，允许订阅器定义通知使用者感兴趣的主题列表。
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