a belt-and-braces policy 什么意思，谢谢

providing double security, in case one security measure should fail
a belt-and-braces policy

也就是提供双重保障的意思

一个腰带和背带策略/政策

腰带和背带策略

牛津高阶英语词典:
belt and braces (informal) taking more actions than are really necessary to make sure that sth succeeds or works as it should: a belt-and-braces policy

Are plans for quality assurance heralded in a new report on the right lines? Three readers think not. The structure of my teaching is overseen by a hierarchy of at least three different committees. We have a teaching committee in the department, there is another one in the university, and then there is the teaching quality assessment panel which comes round once every four or five years.

All these committees were set up for good reasons, educational and political. It is widely accepted that we should follow "best practice", and that students rightly expect us to be explicit about what we are aiming to "deliver" and t