He had no illusions about his talents as a singer.他对自己作为歌手的才华不抱幻想。
I'm under no illusions (= I understand the truth) about the man I married.我对我所嫁的男人不抱幻想。
My boss is labouring under the illusion that (= wrongly believes that) the project will be completed on time.我的老板还存有工程能按时完工的幻想。