the swing of the pendulum
盛衰荣枯 extremes of fortune ; extreme of fortune
他的一生充满了荣枯盛衰。
His life was full of ups and downs.
youdao
罗马帝国在长达一千多年内，经历各种盛衰荣枯，始终屹立不倒，保持了惊人的统一性，一般公认为是由于帝国的保守主义精神。
The State which maintained itself in unbroken continuity throughout the vicissitudes of more than a thousand years is proverbial for its conservative spirit.
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