名词
中文翻译：索引
同义词：
['measure', 'indicator', 'key']
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 new product is designed to meet the index requirements of the industry.
新产品的设计是为了满足行业标准的要求。
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3. The index of the economy has fallen significantly in recent months.
最近几个月，经济指数大幅下降。