illusion

n. 幻觉,错觉,错误的信仰(或观念)

He cherished the illusion that she loved him, but he was wrong.

他抱有她爱他的幻觉，但他错了。

I was under the illusion that he was honest until he was caught stealing some money.

他偷钱当场被人抓住，在此之前我一直误以为他是个老实人。