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- 历史上各个帝国革故鼎新均有兴衰。
Throughout history empires have waxed and waned.
- 帝国经过全盛以后逐渐衰落。
The empire was on the wane after its period of prosperity.
- 通货膨胀是经济衰退的征兆吗？
Is inflation symptomatic of economic decline?
- 到这时，罗马帝国已日益衰败。
By now the power of the Roman Empire was on the wane.
- 病人太衰弱了，不能说话。
The patient is too weak to speak.
- 在以后的几年里，他变得衰弱了。
He grew weak in after years.
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