User contribution to Web sites is often a spontaneous affair.

用户对Web站点作出贡献通常是一种自发的行为。

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Lack the ability to be augmented by the user or practitioner and, thus, can't take advantage of the user's contribution to community content development and enhancement.

缺乏用户或专业人员扩充的能力，因此，无法利用用户对社区内容开发和增强的贡献。

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The 7.1 release of Rational ClearCase also responds to more than 300 user Requests for Enhancement (RFEs), which were selected for their contribution to these core business values.

Rational ClearCase的7.1发布还对300多个用户Requests for Enhancement (RFEs)进行了回应，是根据他们对核心商业价值的贡献进行挑选的。

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In Northern Ireland, the minister said, "we wanted to take a different approach, one that continues to maintain the current balance between public funding and user contribution".

BBC: Northern Ireland Assembly