名词
中文翻译：索引
同义词：
['key', 'pointer', 'reference point']
例句：
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1. The index of the stock market is closely monitored 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 for the past few months.
经济指数在过去几个月里稳步上升。
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3. The index of the company's profits has fallen significantly in the last quarter.
公司的利润指数在上一季度大幅下降。