# 写在前面

- [关于本书](https://book.kaopubear.top/xie-zai-qian-mian/readme.md)
- [第二版前言](https://book.kaopubear.top/xie-zai-qian-mian/preface.md)
- [第三版前言](https://book.kaopubear.top/xie-zai-qian-mian/preface2.md)
- [第四版代序](https://book.kaopubear.top/xie-zai-qian-mian/preface3.md)