Extreme joy turns to sorrow; Happiness at its peak gives way to sadness.
小明在生日派对上玩得非常开心，但他明白乐极哀来，所以提醒自己要珍惜眼前的快乐。
Xiao Ming had a wonderful time at his birthday party, but he understood that extreme joy often turns to sorrow, so he reminded himself to cherish the present happiness.
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