名词
中文翻译：索引
同义词：
['key', 'pointer', 'mark', 'point', 'reference']
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. The index of the economy is a key indicator of future growth.
经济指数是未来增长的一个关键指标。
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3. The index of happiness is a popular way to measure well-being.
幸福指数是一个流行的衡量幸福感的方法。