名词
中文翻译：索引
同义词：
['rank', 'key', 'point', 'marker', 'reference', 'quotient']
例句：
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1. The index of the stock market has fallen sharply.
股市的指数急剧下跌。
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2.The index of the economy is expected to rise in the coming months.
预计经济指数在未来几个月将上升。
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3. The index of happiness is a measure of how happy people are.
幸福指数是一个衡量人们幸福感的指标。