名词
中文翻译：索引
同义词：
['key', 'pointer', 'mark']
例句：
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1. The index of the stock market is closely watched by investors.
投资者密切关注股市指数。
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2. The index for measuring economic growth has increased significantly.
衡量经济增长的指数显著上升。
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3. The index of happiness shows that people's mood has improved.
幸福指数显示人们的心情有所改善。