ephemeral

The beauty of the cherry blossoms is ephemeral, lasting only a few days before the petals fall.

(Chinese) 樱花的美是转瞬即逝的，在花瓣飘落前只能持续几天。

In the world of social media, viral fame is often ephemeral and quickly forgotten.

(Chinese) 在社交媒体的世界里，爆红的名声往往是短暂的，很快就会被遗忘。