曲面的第三基本形式是球面的第一基本形式在曲面上的表示。
The third fundamental form of a surface is the representation on the surface for the first fundamental form of a sphere.
第三部分，文章从心理学的角度，对概念学习的两种基本形式：概念形成、概念同化进行了分析。
The third part mainly introduces the normal theory of the mathematics conception learning, give us two basic modes of conception learning: conception From and conception Assimilation.
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