名词短语
中文翻译：衰退期
同义词：
['decline', 'aging period例句：1. The population is ageing rapidly.（人口正在迅速老龄化。）']
例句：
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1. The population is ageing rapidly.
人口正在迅速老龄化。
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2. The industry is at its age of decline.
这个行业正处于衰退期。
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3. The company's financial performance has shown signs of an age of decline.
公司的财务状况显示出衰退的迹象。