它只检索一个给定客户的全部联系信息。
It merely retrieves the full contact information for a given client.
在圈子里，用户可以更迅速地发送特定消息到一个特定的群体，如兄弟姐妹群，而这些消息通常是他不想与全部联系人分享的。
With Circles, users can more quickly send certain messages to a particular crew, such as siblings or frat buddies, that they wouldn't want to share with their entire list of contacts.
例如，如果要发出一条update语句来更改某个特定客户的联系方式信息中的email地址，就必须在xml列中提供全部联系方式信息，而不仅仅是新的email元素值。
For example, if you want to issue an UPDATE statement to change the E-mail address of a particular client's contact information, you simply have to supply the new E-mail address.
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