He had no illusions about his talents as a singer.他對自己作爲歌手的才華不抱幻想。
I'm under no illusions (= I understand the truth) about the man I married.我對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.我的老板還存有工程能按時完工的幻想。