() to protect a particular amount of money so that it can only be used for a particular purpose 限制（资金的）用途◆a ring-fenced bank account 受限的银行账户
to protect sth by putting restrictions on it so that it can only be used by particular people or for a particular purpose 限制（某事物的）用途◆All employees can access the parts of the Intranet that are not ring-fenced. 所有员工均可进入内部网的开放区。▸ˈring fence
noun
[] ◆The government has promised to put a ring fence around funding for education. 政府承诺要限制教育资金的使用。