名词
中文翻译：阅读指数
同义词：
['reading rate', 'reading volume', 'reading frequency']
例句：
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1. The readingindex has been steadily increasing since the beginning of the year.
自年初以来，阅读指数一直在稳步上升。
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2. The reading index is a crucial indicator for understanding the public's reading habits.
阅读指数是了解公众阅读习惯的关键指标。
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3. The reading index is closely related to the economic growth of a country.
阅读指数与一个国家的经济增长密切相关。