the abilities and experience that make someone suitable for a particular job or activity, or proof of these abilities and experience

There are a number of things that you can do to demonstrate your bona fides as good neighbours. 有好些事情你可以做，来证明自己有作为好邻居的素质。

His political bona fides are questionable. 他在政治方面的能力有些成问题。

To establish his urban bona fides, he lived for several years in council housing. 为了获得城市生活经验，他在市政福利房里住了几年。

a document that proves someone is a particular person or has a particular job or qualification

He produced his bona fides at the police station. 他在警察局出示了自己的身份证明。

Expats are supposed to register to vote in the constituency where they last lived, but there doesn't seem to be much checking of bona fides. 外籍人士应该在他们最后居住的选区登记投票，但似乎并没有什么相应的身份验证。