The study mainly includes three substudies. the first is the study of the content of current physics teaching and learning in junior school;
研究主要包括以下三个分研究：研究一，中学物理教学科研研究内容现状的研究。
The qualitative study mainly includes experimental researches on influencing factors of wear resistance, failure types and mechanisms of the wear of the material and contact analysis.
定性研究主要是对该材料耐磨损性能的影响因素、磨损失效形式、磨损机理进行试验研究和接触分析。
The content of the paper mainly includes: (1) The study on Chinese urbanization pattern.
论文主要内容包括：（1） 中国城市化模式研究。
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