In chapter three, we mainly introduce crossbar switching.

本文第三章的主要内容是交叉开关交换。

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In chapter one, we mainly introduce the background of the research topic.

第一章主要介绍了所研究课题的背景。

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In chapter one, we mainly introduce the appearance of Mohist School's education.

第一章主要介绍墨家教育的出现。

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