N-UNCOUNT
只在短期內有用之物;（短期內有用之物的）收藏品
Ephemera is things people collect such as old postcards, posters, and bus tickets, which were only intended to last a short time when they were produced.
例句
...tickets and other printed ephemera.
票據(jù)和其他短時效的印刷品
...Victorian ephemera.
維多利亞時期短時效用品的收藏