The study first defined the concept of large science popularization activity.

本研究首先界定了大型科普活动的概念。

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Since1995, Beijing Science and Technology Week has been held13 times as a large public science popularization activity.

北京科技周作为一项大型公益性科普活动，自1995年举办以来，今年已经是第13届了。

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So, this dissertation defines it using the characteristics of large science popularization activity, so as to set base for the following study.

因此，本文从大型科普活动的特点出发界定了这个重要的概念，为后文的研究奠定重要的基础。

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