界面如下：

Basically, contact data for SAP Hybris Marketing can be loaded from various sources, such as an ERP system, a web shop, social media and many more.
Contact数据源可以来自各个渠道，例如ERP系统，电商，社交媒体账号等等。
每个渠道都可以成为Marketing Cloud系统里最终完整contact实例的一块拼图，这个完整的contact实例也称为Golden record。
Each source may contribute to the building of the Golden Record, which represents the most valuable contact master data stored in one single record per contact.
而数据源渠道自身也被称为Main facets，用于提供常规意义上的contact信息，以及额外信息，例如地址信息，电子邮箱地址，信用卡号，手机号等等。这些额外信息也称为additional facet。
Therefore, the sources themselves are considered as Main Facets, which might provide general contact data, such as address data or data for customer-specific fields. A Main Facet might also have data, for example, a loyalty card number, an email address, a phone, a mobile or a fax number. Because of their identifyingnature, we consider these attributes as Additional Facets.

上图中的蓝色圆环代表main facets，而黄色圆环代表additional facets。

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