名词
中文翻译：Unknown
同义词：
['circulation ratio', 'circulation rate', 'circulation factor']
例句：
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1. The company's circulation index has been declining for the past few months.
该公司的循环指数在过去几个月一直在下降。
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2. The government is looking into ways to improve the country's circulation index.
政府正在研究提高国家循环指数的方法。
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3. The new policy will have a significant impact on the country's circulation index.
这项新政策将对国家的循环指数产生重大影响。