What does Xi mean by saying "changes unseen in a century" during his meeting with French President?

5/6/2024 Xi Jinping brought up the "changes unseen in a century" again during his meeting with French President Macron. What does he mean by saying "changes unseen in a century"?
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5/6/2024 习近平与法国总统马克龙会面时再提“百年变局”，“百年变局”到底是啥？
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