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在备课过程中,我发现北师大版的七年级《历史教师教学用书》第22课《北方的民族汇聚》中有一段这样的材料解释:
In preparation for the course, I found out that there is one such material explanation in the 22nd lesson of the 7th grade history teacher’s teaching book in the Beijing Normal University’s edition, “The National Gathering of the North.”