•The man's identity was being kept secret while he was helping police with enquiries.这个男子在协助警方调查时，他的身分是保密的。

•I cannot reveal the identity of my source.我不能透露我的消息来源。

•The informant was given a new identity (= a different name and new official documents) for protection.给了线民一个新身分以作保护。

•The newspaper photo apparently showed him in Rome but it was a case of mistaken identity (= it was the wrong person).报纸上的照片似乎显示他在罗马，但其实那个人不是他。

•In prison people often suffer from a loss of identity.在狱中人们经常会失去自我。

•I think my job gives me a sense of identity.我觉得我的工作给了我一种认同感。