ring fence
设防，将某物或某人保护起来以防止其受到外部干扰或侵害
正式·保护资源或资产
英文释义
to protect or separate something, usually a resource or investment, from being affected by external factors or risks
例句
We need to ring fence these funds for education only.
典故来源
源自农业用篱笆圈地保护牲畜，后用于财务或资源保护。