名词
中文翻译：索引
同义词：
['measure', 'criterion', 'standard']
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 closely watched by economists.
经济指数是经济学家密切关注的。
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3. The index for this year's performance is up 5% from last year.
今年的业绩指数比去年提高了5%。