n.朝生暮死；短命；无常的事物
I chose the paper for the ephemerality and the fragility of it. 考虑的理由是它的脆弱性和短暂性；
All of which points out two opposing forces constantly at work on our language: ephemerality and durability. 上述事实说明了不断作用于人类语言的两种对立的因素：短暂性与持久性。
Inactivated Vaccine using French Adjuvant against Bovine Ephemer al Fever 牛流行热病毒法国佐剂灭活疫苗的研制
ephemer 短生植物
