这些文章中的多数其实都是低层次的。

Most of this was at a fairly low level.

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文章介绍了层次模型法的研究背景和研究思想。

This paper introduced the research background and thought of Layer Model Method.

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文章介绍了层次模型法的研究背景和研究思想。

This paper introduced the research background and thought of Layer Model Method.

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