名词
中文翻译：索引
同义词：
['key', 'marker', 'reference']
例句：
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1. The index finger of a human hand is used to point.
人类的手的食指用于指示。
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2. The index of the stock market has been rising recently.
股市的指数最近一直在上升。
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3. The index of the economy shows that it's growing steadily.
经济指数显示经济正在稳步增长。