我以为我看见鬼了，其实只是一种幻觉。 I thought I saw a ghost but it was just an optical illusion.
谵妄一种暂时精神混乱和神志不清的状态，由高烧、酒醉、休克、震惊或其它原因导致。其症状是：焦虑、迷失方向、发生幻觉、妄想、颤抖和说胡话 A temporary state of mental confusion and clouded consciousness resulting from high fever, intoxication, shock, or other causes. It is characterized by anxiety, disorientation, hallucinations, delusions, trembling, and incoherent speech.
吸毒成瘾的人常常产生幻觉。 Drug addicts often hallucinate.
拟精神幻觉的能引起幻觉、幻想或其它精神病症状的，用于药物 Tending to induce hallucinations, delusions, or other symptoms of a psychosis. Used of a drug.
他抱有她爱他的幻觉，但他错了。 He cherished the illusion that she loved him, but he was wrong.
