名词
中文翻译：指数
同义词：
['ranking', 'measure', 'criterion']
例句：
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1. The index of the stock market is closely watched by investors.
投资者密切关注股市的指数。
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2. The index of the economy has been rising steadily since last year.
自去年以来，经济指数一直在稳步上升。
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3. The index of happiness is a widely used metric to measure well-being.
幸福指数是衡量幸福感的一个广泛使用的指标。