名词
中文翻译：索引
同义词：
['rank', 'key', 'point', 'mark']
例句：
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1. The index of the stock market is closely monitored by investors.
投资者密切监控股市指数。
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2. The new product has a high index of quality control.
新产品具有很高的质量控制指数。
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3. The index of the economy rose by 2% in the last quarter.
经济指数在上一季度上升了2%。