to make sure that a sum of money is protected and only used for a particular purpose; to protect a particular area of spending so that there is no reduction in the amount spent on it

Over £500 million was ring-fenced for improvements to the transport system. 有一笔超过5亿英镑的资金被保护起来，专门用来改善公共交通系统。

The following ring-fenced areas account for around 46 percent of total departmental spending. 以下受保护的领域约占整个部门开支的46%。

something that protects a sum of money or area of spending so that it cannot be reduced or is kept separate from other amounts or areas

The company established a ring-fence around losses dating from 2012. 从2012年开始，公司就保证针对亏损的资金不被挪作他用。