学生模型作为PCLS的核心部分，是提供个性化教学的基础和前提。

As the core of the PCLS-Student Model is the basis and prerequisite of personalized teaching.

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而网络爬虫作为搜索引擎核心部分，为搜索引擎的功能实现奠定了基石。

As the core of the search engines, web spider laid the foundation for it.

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它主要是作为控制部分的核心部件。

It is mainly takes the control section the core part.

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它主要是作为控制部分的核心部件。

It is mainly as part of the core components of the control.

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它主要是作为控制部分的核心部件。

It is mainly as part of the core components of the control.

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