我有一种错觉，他要娶我。

I was under the delusion that he intended to marry me.

《柯林斯英汉双解大词典》

科学家们的解释则是，有些北极熊由于饥饿可能会聚集在人类居住区周围。这就导致人们产生一种错觉，误认为北极熊的数量比其实有数量要多。

Scientists have responded by noting that hungry bears may be congregating around human settlements, leading to the illusion that populations are higher than they actually are.

youdao

人们追求完美，但是完美是一种错觉。

People desire perfection, but perfection is an illusion.

youdao

There are philosophers who have said we certainly believe that we've got free will, but it's an illusion.

有这样一些哲学家,他们说,我们确实相信自己有自由意志,但这只是一种错觉

耶鲁公开课 - 死亡课程节选

It's a powerful psychological, you might say, illusion-- people think they want money when, in fact, they should want real goods and services.

你可能会说，这是一种，强烈的心理错觉-,人们认为他们需要货币时，实际上，他们想要的是实物以及服务。

耶鲁公开课 - 金融市场课程节选

But the pause is a psychological illusion.

但停顿只是一种心理错觉而已

耶鲁公开课 - 心理学导论课程节选