单词学习：impermanence 名词 (抽象概念)
impermanence
/ɪmˈpɜːrmənəns/
无常；暂时性；非永久性
Mr. Gu explained the concept of impermanence in his philosophy class, reminding students that all things are in a constant state of change.
顾老师在哲学课上解释了无常的概念，提醒学生们万物都处于不断变化的状态。
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