A hallucination is a sight, sound, smell, taste, or touch that feels real but is not there — or the experience of that happening. Hearing a voice when nobody is speaking, or seeing a person who is not in the room, are typical examples.

A hallucination is a sight, sound, smell, taste, or touch that feels real but is not there — or the experience of that happeninghallucination是一種感覺很真實、但其實不存在的視覺、聲音、氣味、味道，或觸覺——或者說是那種經驗發生的過程。Hearing a voice when nobody is speaking, or seeing a person who is not in the room, are typical examples聽到一個聲音、但根本沒有人在說話，或是看到一個根本不在房間裡的人，都是典型的例子。

Doctors use the word with illness, high fever, no sleep, or drugs.

Doctors use the word with illness, high fever, no sleep, or drugs醫生會在講到疾病、高燒、沒睡覺，或藥物的時候用這個詞。

Though actually, it is not the same as an illusion: an illusion is a real thing that looks wrong, like a stick that looks bent in water. And it is not quite a delusion, which is a false idea you keep believing.

Though actually, it is not the same as an illusion: an illusion is a real thing that looks wrong, like a stick that looks bent in water不過其實，它跟illusion不一樣：illusion是一個真實存在的東西看起來不對，就像一根棍子在水裡看起來是彎的。And it is not quite a delusion, which is a false idea you keep believing它也不完全等於delusion，那是一種你一直相信下去的錯誤想法。

Everyday talk sometimes stretches it — “that cake was a hallucination” — to mean it looked too good to be true. That is play, not the medical sense.

Everyday talk sometimes stretches it — 'that cake was a hallucination'日常對話裡有時候會把這個詞延伸——「that cake was a hallucination」（那個蛋糕美到不像真的） to mean it looked too good to be true用來形容一個東西好到不像真的。That is play, not the medical sense那只是玩笑話，不是醫學上的意思。