To what extent competition determines the composition of a community and the density of particular species has been the source of considerable controversy.

竞争对于一个群落的组成和特定物种的密度的决定程度有多大，一直是相当有争议的问题。

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If this "social norm" or "community benefit" source was true, why wouldn't it hold true for other animal groups?

如果这个社会规范和造福社会的来源是真实的，那么为什么对其它动物群体而言是不真实的呢？

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Driven by an active open source community.

由一个活跃的开放源码社区所驱动。

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The Sakai Educational Partners' Program (SEPP) extends this community source project to other academic institutions around the world, and is supported by the William and Flora Hewlett Foundation and SEPP member contributions.

UNESCO: Free and Open Source Software for E-learning

The Sakai Project is a community source software development project founded by the University of Michigan, Indiana University, MIT, Stanford, the uPortal Consortium, and the Open Knowledge Initiative (OKI) with the support of the Andrew W. Mellon Foundation.

UNESCO: Free and Open Source Software for E-learning

The open source community also provides continuous quality control and is a great source of continuous innovation.

FORBES: Revolution in the Big Data and Business Landscape