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。
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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