ephemeron

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。

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。

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。