在详细讨论上述三个原因之前，我们首先了解一些背景知识，以便更好地理解这种错误发生的原因。

Before considering each of the three causes above in more detail, let's first look at some background to help you better understand why this happens at all.

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本文首先介绍了股票分析与预测的背景知识和方法，其次对数据挖掘理论做了深入细致的研究，然后着重从以下三个方面展开讨论。

Then do a thorough and meticulous research into the theory of data mining. At last discuss the following three aspects:First of all, focus on the research into financial indexes of stock.

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本文首先介绍了可扩展操作系统的历史背景。然后，分析了可扩展操作系统结构下设计存储管理子系统的三个关键问题：性能、可扩展性和完整性。

Firstly, this paper introduces the history of extensible OS, and then analyses three key issues in memory management under extensible OS, which are performance, extensibility and integrity.

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