过眼烟云 passing smoke and clouds
Explanation
比喻很快消失的事物，像从眼前飘过的云烟一样转瞬即逝。
Metaphor for something that quickly disappears, like smoke passing before the eyes.
Origin Story
话说唐朝时期，一位年轻的书生李白，怀揣着满腹经纶和一颗渴望功名的心，来到长安参加科举考试。他信心满满地准备了几个月，最终却落榜了。李白十分沮丧，觉得自己多年的努力付诸东流，心情郁闷到了极点。他漫步在长安城的大街上，看着熙熙攘攘的人群，听着喧嚣的叫卖声，感到自己格格不入。他想起自己曾经在山村里过着平静的生活，与世无争，自由自在。长安城的一切在他眼中都成了过眼烟云，名利也变得不再重要。于是，他决定离开长安，继续追求他心中的理想。他开始游历名山大川，写下了一篇篇传世之作。他的一生虽然没有取得很大的功名，但他的诗歌却流传千古，被人们传诵至今。
During the Tang Dynasty, a young scholar named Li Bai, full of ambition and a desire for fame, traveled to Chang'an to take the imperial examination. After months of preparation, he failed. Li Bai was very discouraged, feeling that years of hard work were in vain. He strolled through the bustling streets of Chang'an, feeling like an outsider. The city that he had once viewed as the pinnacle of his aspirations now seemed like a fleeting illusion. The fame and fortune he had sought seemed unimportant. He decided to leave Chang'an and follow his dreams. He travelled across mountains and rivers and wrote many literary works that are still famous today. Even though he never attained a high position in the empire, his poems became immortal.
Usage
用于形容那些转瞬即逝，不值得留恋的事物。
Used to describe things that are fleeting and not worth lingering on.
Examples
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他年少时的经历，如今看来不过都是过眼烟云。
ta nianshao shi de jingli,rujin kanlai buguo dou shi guo yan yan yun.
His experiences in his youth are now just a thing of the past.
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这场风波，最终也成了过眼烟云，很快被人们遗忘了。
zhe chang fengbo, zhongjiu ye chengle guo yan yan yun, hen kuai bei renmen yiwangle.
This storm in a teacup was quickly forgotten; it all became a thing of the past.