Based on the primary quadric error metric arithmetic, combined with boundary constrained condition and normal restriction, the primary arithmetic is modified and the application scope is extended.

在二次误差度量算法的基础上，考虑边界约束条件和法向量限制，扩展了算法的应用范围。

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At primary school, it says there should be more emphasis on arithmetic and that some topics, such as the calculation of fractions, volume and area should be covered earlier.

BBC: Maths skills add up to higher earnings, study finds