The sun at its zenith begins to decline, and the moon at its fullest begins to wane. This idiom signifies that things, when they reach their peak or extreme, inevitably begin to decline or transform into their opposite.
他的人生经验告诉我们，凡事不可过于追求极致，因为日中则昃，月盈则食，任何事物发展到顶峰后都可能走向衰落
His life experience tells us that one should not pursue extremes in anything, for the sun at noon begins to set, and the moon at its fullest begins to wane; everything that develops to its peak may eventually decline.
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