So, rumination in mathematics learning is a key link in mathematics learning activities . But now it is a weak one among students.

因此反思性数学学习是数学学习活动的最重要的环节，但它是目前数学学习中最薄弱的一个环节。

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The main idea of this article is to discuss the close relation between the teaching of economic mathematics and economic activities.

本文主要讨论经济数学教学改革的几点尝试，其中心是密切应用数学与经济活动的关系。

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They are usually used for mathematics or writing activities.

它们通常用于数学或者写作。

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The International Basic Sciences Programme (IBSP) of UNESCO and the International Mathematical Union (IMU) are leading this Mathematics of Planet Earth Day and the international exhibition which is an important component of the year of scientific and outreach activities, Mathematics of Planet Earth 2013 (MPE2013), under the patronage of UNESCO.

UNESCO: Mathematics of Planet Earth Day