广告牌系统的制造商称，广告牌没有保留任何个人信息或是录制任何视频。

The advertising board system maker said it didn't keep any personal information or record any videos.

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如果查询丢失，对该信息的请求者可能不太方便，但原始数据保留在系统中，可以再次进行请求。

If the query is lost, it might be inconvenient to the requester of that information, but the original data remains in the system and can be requested again.

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MDM模式与前两个模式之间有着明显的区别，因为MDM只保留一个版本的事实，而且有效地从逻辑和物理两个方面将各个不同的信息系统集成到了一起。

MDM stands up as a distinct pattern from the previous two because MDM holds the single version of truth and effectively integrates various information systems from both logical and physical aspects.

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