以下为句子列表：
英文: An index usually tracks a broad segment of a market and is measured against its base value while a stock average usually contains a smaller number of components and is recalculated daily to reflect price changes.
中文: 一个指数通常表现一个市场中的大部分股票并以基数价值来衡量，而股票平均指数通常包含较少的股票并且每日都重新计算来反映价格变化。
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