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have a ~
常用have来描述产生幻觉。
He has a hallucination that he is being followed.
他有一种被跟踪的幻觉。
幻觉
先理解核心含义，再看它在真实句子里的用法。
幻觉
an illusory perception, such as seeing or hearing something that is not there; a common symptom of severe mental disorder
He has a hallucination that he is being followed.
他有一种被跟踪的幻觉。
感知不存在的事物,通常由神经系统紊乱引起,如震颤性谵妄
A sensory perception of something that does not exist, often arising from disorder of the nervous system, as in delirium tremens.
幻觉感知；严重精神障碍的常见症状
illusory perception; a common symptom of severe mental disorder
产生幻觉的行为；神志恍惚；错误、过失或疏忽。
The act of hallucinating; a wandering of the mind; an error, mistake or blunder.
错误或无根据的观点或想法
a mistaken or unfounded opinion or idea
After staying awake for two days, he started to see hallucinations that no one else could see.
连续两天没睡后，他开始看到别人看不到的幻觉。
AI contextual example
The patient's vivid hallucinations made it hard for her to tell what was real.
病人逼真的幻觉使她难以分辨什么是真实的。
AI contextual example
Loud music alone cannot cause hallucinations; they usually have a medical cause.
仅靠大声音乐不会引起幻觉；它们通常有医学上的原因。
AI contextual example
his dreams of vast wealth are a hallucination
他对巨额财富的梦想是一种幻觉
WordNet
常用have来描述产生幻觉。
He has a hallucination that he is being followed.
他有一种被跟踪的幻觉。
Patients with schizophrenia often suffer from hallucinations.
精神分裂症患者常受幻觉之苦。
形容词常为感官类型，如听觉(auditory)、视觉(visual)等。
Visual hallucinations are common in certain migraines.
视觉幻觉在某些偏头痛中很常见。
Not this
He had hallucination.
Use this
He had a hallucination.
Hallucination是可数名词，表示一次具体的幻觉时需加冠词a或使用复数形式。
Not this
The mirage was a hallucination.
Use this
The mirage was an illusion.
Hallucination指无外界刺激的感官幻觉，而illusion指视觉上的错觉或假象；海市蜃楼是光学现象，应用illusion。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
幻听
The patient described auditory hallucinations that were very distressing.
病人描述了令其非常痛苦的幻听。
幻视
Certain migraines can cause vivid visual hallucinations.
某些偏头痛会引发生动的幻视。
产生幻觉
If you have hallucinations, you should see a doctor immediately.
如果你出现幻觉，应立即就医。
受幻觉困扰
Many people with schizophrenia suffer from hallucinations.
许多精神分裂症患者会受幻觉困扰。
药物引起的幻觉
Drug-induced hallucinations can last for several hours.
药物引起的幻觉可持续数小时。
人工智能幻觉
AI hallucination is a problem when chatbots confidently provide false information.
人工智能幻觉是指聊天机器人自信地提供错误信息的问题。
人工智能幻觉（指AI自信给出但错误的信息）
The company warned that an AI hallucination could appear in the generated summary.
该公司警告说，生成的摘要中可能出现人工智能幻觉。
集体幻觉（一群人共同持有的错误认知或错觉）
The housing boom was partly a collective hallucination that fooled the whole market.
房地产繁荣在某种程度上是一场骗过整个市场的集体幻觉。
Use hallucination naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
谐音联想：“哈喽，新内神”？幻觉中你对一个不存在的人打招呼。
语域：neutral 常见场景：medical/clinical psychology and psychiatry、AI and technology discussions 该词在医学、心理学及人工智能等专业语境中为中性正式用词；日常口语中通常较少直接使用，但并非不礼貌。具体含义需依上下文判断。
这些词与 hallucination 的结尾 -ation 拼写相同，重音都落在 -ation 的 a 上，读作 /ˈneɪʃən/，因此与 hallucination 押韵。注意 hallucinate 和 hallucinogen 拼写相近，但重音和结尾发音不同，并不押韵。
Dictionary facts from ECDICT, WIKTIONARY.