Three theories were used to support group correction: the theory of Bruffee's collaborative learning, the theory of Piagets constructivism, and the theory of Carl R.

三个理论被用来支持作者的观点，即合作学习理论，建构主义学习理论和罗杰斯的人文主义个性心理学理论。

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Three characteristics of brain information processing are summarized: selective, adaptable and cooperative, and neural-group. Selective theory including these characteristics is addressed.

总结脑信息处理的三个特性：选择性、适应性及协同性，并论述了涵盖此三个特性的神经元群选择理论。

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Under the circumstances that do not have the aid of group theory, we give three direct ways to calculate the rotation matrix.

在不借助群论的条件下，给出了转动矩阵的三种直接计算方法。

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