When water reaches its full capacity, it overflows; figuratively, when things develop to an extreme, they tend to turn into their opposite, or an excess of anything can lead to negative consequences.
小明在期末考试中取得了全班第一的好成绩，但老师提醒他，水满则溢，要继续努力，保持谦虚，不能骄傲自满。
Xiao Ming achieved the top score in the class for the final exam, but his teacher reminded him that 'when water is full, it overflows,' so he should continue to work hard, remain humble, and not become complacent.
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