用英语翻译下述文字：论文第二章节需要删减SAR成像中的BP算法、CS模型是传统且广为人知的作者使用了大篇幅进行介绍过于冗余。
Chapter 2 of the paper needs to be reduced. The BP algorithm and CS model in SAR imaging are traditional and well-known, and the author has excessively elaborated on them, which is redundant.
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