He retreated into a world of fantasy.

他遁入了幻想世界。

《牛津词典》

George lives in a world of fantasy.

乔治整天生活在幻想的世界中。

youdao

She retreated to a world of fantasy.

她退缩到她的幻想的世界中。

youdao

It kind of helped me live in a fantasy world as a child."

VOA: special.2009.11.27

So when Black Heels crossed my desk, I tucked it in my bag on a Friday afternoon, and looked forward to a weekend on my couch (I was also stricken with my 287th cold of the season) lost in a fantasy world of love, and good cooking and strapping cowboys wrangling cattle.

FORBES: Connect

The central idea here is that Colleen is lost in a fantasy world of violence, which in effect, can be claimed about anyone who has ever played an M-rated video game.

FORBES: On Video Games as a Political Liability

There's a whole world of sort of fantasy and illusion out there that makes dating full of lies to begin with and probably even more so when you're online, and I think people kind of like it that way.

NPR: Slate's Jurisprudence: The Laws of Internet Dating