高中生缺少基础的历史知识总体上是因为他们花更少的时间在学习基本社会学科上。
High school students' lack of a historical knowledge base can partially be explained by the decrease in class time spent on social studies at the elementary level.
在一个以知识为基础，而知识都是免费的社会中，注意力成了有价商品。
In a knowledge-based society in which knowledge is free, attention becomes the valued commodity.
我已经建立了一个坚实的基础，专业知识，以及一个经验丰富的社会活动。
I have established a solid foundation of professional knowledge, and a rich experience of social activities.
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