adj.短暂的，瞬息的
n.生命短暂的事物，短生植物

The butterfly's life is ephemeral, as it only exists for a brief period during the summer.
这只蝴蝶的生命是短暂的，它仅在夏季存在很短的时间。
The memories of our childhood are often ephemeral, fading quickly with time.
我们童年的记忆往往是转瞬即逝的，随着时间的推移很快就会消退。
The beauty of cherry blossoms is ephemeral, as they bloom and fall within weeks.
樱花的美丽是短暂的，它们在几周内盛开又凋谢。
Ephemeral art forms, like sand sculptures or graffiti, can be admired but not preserved forever.
转瞬即逝的艺术形式，如沙雕或涂鸦，可以欣赏但无法永久保存。
The Internet trend of viral memes tends to be ephemeral, disappearing just as quickly as they gain popularity.
网络上的病毒式 meme 往往是短暂的，一旦流行起来就迅速消失。
In nature, the lifecycle of an ephemeral plant species is very short, usually lasting only one growing season.
在自然界中，一些短暂的植物种类生命周期很短，通常只有一年生长期。
The festival was an ephemeral gathering, with people from all walks of life coming together for a few days.
这个节日是一次短暂的聚会，各行各业的人们相聚几天。
Their marriage was an ephemeral union, marked by frequent separations and disagreements.
他们的婚姻是短暂的结合，充满了频繁的分离和争吵。
The company's success was fleeting, as it vanished from the market within a year.
这家公司的成功是昙花一现的，一年后就从市场上消失了。
The social media platform promised to be eternal, but its popularity turned out to be ephemeral.
这个社交媒体平台曾承诺永恒，但其受欢迎度却是转瞬即逝的。