illusion
A phenomenon in which a person perceives something different from what is actually there, even though there is nothing wrong with the sensory organs. It is distinguished from a hallucination, in which a non-existent object is thought to exist.
一個人認爲與實際情況有所不同的現象，即使感覺器官沒有錯。它與幻覺區分開，其中不存在的物體被認爲存在。