"小众文化" 的英文翻译为 "niche culture".

来源：这个词的用法可以追溯到20世纪60年代，当时主流文化的影响力逐渐弱化，许多具有独特性和特殊兴趣的文化开始出现。

例句：

"Niche culture has gained popularity in recent years, with more and more people interested in subcultures outside of the mainstream." (小众文化近年来越来越受欢迎，越来越多的人对主流文化以外的亚文化感兴趣。)
"The growth of niche culture has given rise to many unique and speciapzed communities onpne." (小众文化的增长引发了许多独特且专业的线上社区。)
"Some niche cultures, such as cosplay and otaku, have become more mainstream and widely accepted in recent years." (一些小众文化，例如cosplay和otaku，近年来已经变得更加主流和广泛接受。)