A popular approach is to sell proprietary extensions to an open-source core.

一种流行的方式是向开源的核心程序出售专利的扩展功能。

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Nuxeo will continue to sell commercial support on top of the open-source core as well as staffing the initial contributors.

Nuxeo会继续针对开源核心销售商业化的支持，并为最初的贡献者配备工作人员。

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Some scholars argue that the concentration of water within the urban core of these sites provided a centralized source of political authority for Maya elites based largely on controlled water access.

一些学者认为，集中在这些地点的城市核心区的水资源为玛雅精英提供了一个集中的政治权力来源，而这些权力主要是基于对水资源的控制。

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By taking such an approach the association becomes recognized as a core source for cutting-edge understandings that members can use to become more successful.

FORBES: How to Dramatically Grow an Association's Membership and Sponsorships

Also driving the mergers: the need to boost listings, a core source of revenue for the exchanges as they battle to preserve their share of trading volume against competition from new market entrants like Kansas City-based BATS Trading, which siphons about 8% of Nasdaq's daily volume and 5% of NYSE volume.

FORBES: NYSE Looks For Options

In late January 2002, SCO announced that it was creating a division to expand licensing its intellectual property, including the core Unix source code.

FORBES: Magazine Article