This article has first expounded the writing agent as well as the writing significance in the foreword.

本文首先在前言中阐明了写作的动因以及写作的意义。

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In this section, first expounded the "moral and social," the theoretical basis for the preparation of teaching materials, and then compare the two versions of textbooks.

在这部分，首先阐述了《品德与社会》教材编写的理论依据，然后是对两个版本教材的比较。

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He conducts a class dedicated to the understanding of 'intelligible and sensual design in inner and outer nature', first expounded by Immanuel Kant.

他带了一个班，专门致力于研究可识别的感官构思在内部和外部自然表现，这一概念首先是由康德阐述的。

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In the speech, the president did not change the broad outline of the vision for the US space agency he first expounded in his 2011 federal budget request.

BBC: Obama sets Mars goal for America