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The only thing that is constant is change.
The past is always changing. It is not fixed. The past is not stable.
Cheerfulness is the best promoter of health.
译文:最大的悲哀莫过于听不得别人批判自己的错误,最大的耻辱莫过于不知道羞耻。赏析:我们要善于听取逆耳忠言,敢于接受对方的批评,有错误更要及时改正,不要一错再错,错上加错。