When things reach their peak or extreme, they inevitably begin to decline; a metaphor for the cyclical nature of prosperity and recession.
他深知月满则亏的道理，因此在事业巅峰时期选择了稳健发展，而不是盲目扩张。
He deeply understood the principle that when the moon is full, it begins to wane, and therefore, at the peak of his career, he chose steady development instead of blind expansion.
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