transiency 

英汉解释

n. 无常；稍纵即逝

同义词

n. transience，transitoriness

参考例句

1. All things were known eternally and were poignant in their transiency.
世间万物都是永恒可知的，即使稍纵即逝。
2. All things were known eternally and were poignant in their transiency.
世间 万物都是永恒可知的，即使稍纵即逝。
3. The poet, confined to his bed with a serious illness, hears the bells of the church adjoining, and is thereby reminded of death and the transiency of human life.
诗人因为重疾卧病在床，听到附近教堂丧钟声，因此联想到死亡及生命的短暂。

英英解释

n.
  1. an impermanence that suggests the inevitability of ending or dying

网络释义

transiency
顷刻; 暂时性; 虚幻; 顷现性;
transience transiency
顷刻;