数学工作者从铁道调车问题，抽象出一个数学问题，称为数列的成组剖分问题。
From the train marshalling problem, mathematicians autline a mathematics model, called as "the digit—grouped partition of sequence", and give some results.
数学教学心理是教育心理学工作者的重要研究领域。
Mathematical instructional psychology was an important research field for educational psychologist.
数学教学心理是教育心理学工作者的重要研究领域。
Mathematical instructional psychology was an important research field for educational psychologist.
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