名词
中文翻译：索引
同义词：
['key', 'pointer', 'mark']
例句：
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1. The indexof the stock market is closely watched byinvestors.
投资者密切关注股市的指数。
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2. The indexof the economy has been on the risesince the beginning of the year.
自年初以来，经济指数一直在上升。
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3. The indexof the company's profits has increasedsignificantly in the past quarter.
该公司过去季度的利润指数显著提高。