impermanence
n. 无常；暂时性
例句
He was convinced of the impermanence of his work.
他确信其工作是暂时的。
《柯林斯英汉双解大词典》
This is what we call "impermanence".
这就是所谓无常之理了。
Impermanence is a Blessing, not a Curse.
无常是祸中有福，并非诅咒。
