ephemeral /ɪˈfɛmərəl/ TEM8

• 1. 

  ADJ If you describe something as ephemeral, you mean that it lasts only for a short time. 短暂的; 瞬间的 [正式]

  例：

  He talked about the country's ephemeral unity being shattered by the defeat.

  他谈到战败彻底粉碎了国家的短暂统一。