chapter20.4.2 勘误

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#235 opened on Sep 28, 2021 0 comments 0 reactions 0 assignees View on GitHub

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用的是2020年3月河北第17次印刷版本，最新的pdf版也同样存在该错误

![331](https://user-images.githubusercontent.com/86274760/135091639-fe535bea-b0ea-4903-ad70-8ba4442cf264.png)

英文原版为

![332](https://user-images.githubusercontent.com/86274760/135091947-e512d805-d1ea-4838-a61d-f792121d7765.png)

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