名词
中文翻译：指数
同义词：
['measure', 'index', 'criterion']
例句：
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1.The index of the stock market has been rising steadily for the past few months.
股市的指数在过去几个月里稳步上升。
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2.The index of the economy is closely watched by economists around the world.
经济指数受到全世界经济学家的高度关注。
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3. The index of happiness is a measure of how satisfied people are with their lives.
幸福指数是衡量人们对生活满意度的一个指标。