permanence
noun [uncountable]the state of lasting for a long time or for all time in the future 永久；持久性 The spoken word is immediate but lacks permanence. 口头之言便捷，但不持久。 We no longer talk of the permanence of marriage. 如今，再没有人说婚姻要天长地久了。 lacking a sense of permanence in his life 他的生活缺乏永恒感
Word Originlate Middle English: from medieval Latin permanentia (perhaps via French), from permanent- ‘remaining to the end’, from the verb permanere.