创造一个虚构的世界用英语怎么说？

创造一个虚构的世界

...creating an imaginary world.

creating

v. 创造( create的现在分词 )，引起，造成，封；

例句
His political adversaries were creating a certain amount of trouble for him.
他的政敌正在给他制造一些麻烦。

an

art. 一（在元音字母前代替不定代词a），一任一某一，一个；

例句
He started eating an apple...
他开始吃苹果。

imaginary

adj. 想像中的，假想的，虚构的，[数]虚数的，幻，虚幻；

例句
He had invented an imaginary son, in order to make up for his real son's failings.
为了弥补现实中儿子的不足之处，他就想象出了一个儿子。

world

n. 世界，地球，领域，尘世；

例句
Rosie's idyllic world came to an abrupt end when her parents' marriage broke up...
父母婚姻的破裂使得罗茜田园诗般美好的世界陡然画上了句号。