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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The influence of central executive of working memory on arithmetic cognitive strategies of 113 children in primary 2 by using dual-task paradigm was explored.

运用“双重任务”范式，以113名小学二年级儿童为被试，考察了儿童工作记忆的中央执行对算术认知策略表现的影响。

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There are three main sections found in the CPU of a typical personal computer system: the primary storage section, the arithmetic-logic section, and the control section.

一台典型的个人计算机的CPU由三部分组成：主存储部分、算术-逻辑部分和控制部分。

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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