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下面的一个案例许多中学教师也许觉得比较熟悉:案例1 (一节解方程课开始的片段)教师:像往常一样,我们先来讨论作业.在
In the following case, many secondary school teachers may feel more familiar: Case 1 (A fragment of the beginning of a solution equation class) Teacher: As usual, we first discuss homework.