things that are important or used for only a short period of time 只在短期内有用的事物 a collection of postcards, tickets and other ephemera 明信片、票证和其他短时效物品的收藏系列
Word Originlate 16th cent.: plural of ephemeron, from Greek, neuter of ephēmeros ‘lasting only a day’. As a singular noun the word originally denoted a plant said by ancient writers to last only one day, or an insect with a short lifespan, and hence was applied (late 18th cent.) to a person or thing of short-lived interest. Current use has been influenced by plurals such as trivia and memorabilia.