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1·Pingback: Check out the specification of the pingback protocol for notifying Web authors of links to their documents.

Pingback：阅读 pingback 协议的规范，该协议用于通知 Web 作者指向他们文档的链接。

2·A TrackBack could be implemented to perform such a check as well, but it's more a fundamental part of the pingback specification.

虽然可实现TrackBack来执行这样的检查，但它更多的则是pingback规范的一个重要部分。