ephemeral
词根词缀：
ephemera n. 生命短促的人（或物）
ep〔= e 加强〕+ hemer 一天 + a → 只出现一天的东西 → 生命短促的人〔或物〕
ephemeral adj. 转瞬即逝的
ep + hemer 一天 + al …的，具有…性质的 → 一天就消失 → 转瞬即逝的
数据来源：新东方英语词汇速记大全
相关例句：
Entropy increases, but complexity is ephemeral; it increases and decreases in complex ways, unsurprisingly enough.
熵在不断增加，但复杂状态是短暂的；复杂性以复杂的方式增加和减少，这一点也不令人意外。
There smiles the Divine Child among his playthings of unmeaning clouds and ephemeral lights and shadows.
那圣洁的孩子在乏味的云层和倏忽变幻的浮光掠影中嬉戏微笑。
The storage is called ephemeral, because when you shut down your instance, the information is gone forever.
这种存储之所以称为临时存储，是因为当您关闭您的实例时，信息将永远消失。
However, some of the most beautiful and incredible occurrences are ephemeral, creative and destructive all at the same time.
然而，一些最美丽的和令人难以置信的事物的短暂性、创造性和破坏性同时存在。
Never bowing to the whims of ephemeral fashion, we have always held on to solid and lasting values.
决不屈从于古怪而短暂的时尚，我们始终紧紧坚持可靠与持久的价值。
Yet hope springs ephemeral in this production.
然而，在这部作品中希望只是昙花一现。