CNKI by retrieving relevant documents with information found in this study: on private schools specializing in training, after-school sports very little literature.
通过检索cnki中与本文研究相关文献资料发现：关于专门研究民办中学课余体育训练方面的文献很少。
Based on a serial study on twilight problems, this paper proposes a scheme for retrieving the vertical distribution of stratospheric aerosols using the intensity observations during twilight periods.
本文基于对曙暮光问题的系列研究，提出一个用曙暮光时的光强观测资料反演平流层气溶胶垂直分布的方案。
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