a(n) ephemeron
The butterfly is an ephemeron, living only for a few days.
蝴蝶是一种朝生暮死的生物，只能活几天。
短暂的事物；转瞬即逝的事物
ephemera — plural of ephemeron
瞬态引用；弱引用的一种；短命的事物,转瞬即逝的东西。；垃圾回收编程语言中的一种弱引用,不允许对象被终结器保持存活。；蜉蝣
短命的事物,转瞬即逝的东西。
Something short-lived or transitory.
垃圾回收编程语言中的一种弱引用,不允许对象被终结器保持存活。
A type of weak reference in a garbage collected programming language that does not permit an object to be kept alive by its finalizer.
The ephemeron, a mayfly, lives only for a single day in its adult form.
蜉蝣这种生命短暂昆虫，其成虫形态只能存活一天。
用法提示：ephemeron 作名词，直接指代蜉蝣这种短命昆虫。
Many consider the fashion trend to be an ephemeron, destined to fade within months.
许多人认为这股时尚潮流不过是昙花一现，注定几个月内就会消退。
用法提示：ephemeron 作名词，比喻转瞬即逝的事物。
In literature, an ephemeron often symbolizes the fleeting nature of life.
在文学作品中，蜉蝣常象征生命的短暂。
用法提示：ephemeron 作名词，指代蜉蝣并用于象征意义。
The butterfly is an ephemeron, living only for a few days.
蝴蝶是一种朝生暮死的生物，只能活几天。
用于抽象事物，表示某事物的短暂性。
He wrote about the ephemeron of youth.
他写到了青春的短暂。
Fame is like an ephemeron, here today and gone tomorrow.
名声就像蜉蝣，今天还在明天就消失了。
形容词 vs 名词；描述短暂的特性 vs 短暂的事物本身
复数名词 vs 单数名词；短暂事物的总称 vs 单个短暂事物
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Dictionary facts from ECDICT, WIKTIONARY.