N-UNCOUNT [oft aNOUN]脱离实际的幻境 If you say that someone is living in cloud-cuckoo-land, you are criticizing them because they think there are no problems and that things will happen exactly as they want them to, when this is obviously not the case. 脱离实际的幻境 [mainly British, disapproval]
I was living in cloud-cuckoo-land about my salary expectations.