... rules of administration 管理规章 rules of arithmetic 算术定则 ruling 刻度，划线，管理，支配，直纹面母线 ...
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four rules of arithmetic 加减乘除
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The rules of arithmetic are simple, and all these tools follow them faithfully.
算术规则非常简单，所有这些工具都忠实地遵守它们。
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Based on actual learning, this research had studied primary students' learning about rules of arithmetic operation by worked-example learning.
本研究立足于学习实际，对小学生通过样例学习运算规则进行了实验研究。
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