存在很久英语

to existto be【例句用法】1. 年轻女子被举荐入宫（觐见君主）的风俗已不复存在。 The custom of young ladies being presented at court (ie formally introduced to the monarch) has disappeared.

liveexist/existanceappearliving

last (for) a long time 【俊狼猎英】团队为您解答。 祝你进步。请尽快采纳。

长期存在的问题alongstandingissue

It came into being for at least twenty years.

看不懂这个问题，可否具体一点

它已经存在至少20年了It has been in existence for at least 20 years.它已经存在至少20年了It has been in existence for at least 20 years.

stay for a long time