The notion of conservation is that there's ways to transform things such that some aspects of them change but others remain the same.

守恒是指物体某方面的特征,不会因为其他方面特征的改变,而有所改变

耶鲁公开课 - 心理学导论课程节选

And so, if you rewind the tape and play it again over and over and over again, each time you set things up the very same way they must move or transform or change or end up in the very same state.

所以,如果你将一盘磁带,反反复复地播放,每次你播放的内容,从头到尾的起承转合一定是,绝对一致的

耶鲁公开课 - 死亡课程节选