The drug induces hallucinations at high doses.大剂量服用该药会致幻。

Hallucination is common in patients who have suffered damage to the brain.脑部受损的病人常常会产生幻觉。

Perhaps they think I'm a ghost, unreal, a hallucination, a trick of drugs or the night.也许他们认为我是个虚幻的鬼魂, 是个幻象, 是药物或黑夜引起的幻觉。

Perhaps the footprint was a hallucination.脚印可能只是幻象。