他以谈论幻觉来证明自己的观点，声称我们也可能正在做梦。

He does this by talking about illusions and also by arguing that we could be dreaming.

youdao

那个女孩是他的幻觉，是他混乱的头脑中妄想出来的。

The girl was a mirage, cast up by his troubled mind.

《柯林斯英汉双解大词典》

饥饿使他产生了幻觉。

Hunger made him hallucinate.

《柯林斯英汉双解大词典》

It's an illusion,or a delusion,but he didn't really have the genuine memory.

是幻觉，或者错觉，他没有真正的记忆。

耶鲁公开课 - 死亡课程节选

So, it's motivated by a huge blindness about the racial history of the United States in any of its detail. That sense of the oneness, I think, points to why and how he makes that illusion, the oneness.

所以这是由对美国种族历史,及其细节部分的极大无知所推动的，这样的一种同一性，我想表明了他为什么及怎样产生了那一幻觉，那种同一性。

耶鲁公开课 - 1945年后的美国小说课程节选