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number of components
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【化】 组分数
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详细解释：
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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。
更详细...
英文: However, the selection of number of components in the mixture for a sample data set is still a rather difficult task.
中文: 然而，如何仅仅针对一组来自于某个有限混合体模型的数据选择出分量或聚类的个数则依然是一个非常困难的问题。
更详细...
英文: This problem is not unique to biological computers—it is an inherent property of complex systems; even mechanical devices become more unreliable as scale diminishes and the number of components increases.
中文: 不是生物计算机才有这样的问题，这是复杂系统的固有特性，即使是机械仪器，如果体积缩小、零件增加，也会有这种问题。
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