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 has been rising steadily.
股市的指数一直在稳步上升。
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2. This index measures the performance of the economy over a specific period.
这个指数衡量了特定时期内经济的表现。
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3. The index is used to calculate the average price of goods sold in a store.
这个指数用于计算商店中售出商品的平均价格。