These seven building blocks--identity, presence, relationships, conversations, groups, reputation and sharing--provide a good functional definition for social software.
这七个组成部分——身份，状态，关系，交流，小组，名誉，分享——给社交网络软件下了个不错的实用定义。
2
In this paper, We give a geometrical definition of conditional expectation. Identity of the definition and other definitions is discussed.
本文给出了条件数学期望的几何定义，证明了该定义与其它定义的一致性。
3
Writing from the definition of ethnic identity and its relationship with culture, this paper, based on the study and analysis of a typical case, explains the characteristics of modern ethnic groups.