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人教版初三几何课本关于圆一章的例题,有四处标有“注意”的叙述文字,它给出了添加辅助线的规律,为了帮助同学们正确理解、灵
There are four descriptive texts marked with “attention” in the example textbook of the third edition of the People’s Education Press. It gives the rules for adding auxiliary lines, in order to help the students understand the spirit correctly.