Fourth chapters and fifth chapters are the article priority content.
第四章和第五章是文章的重点内容。
The propagation characteristics and the singularity effect of a hollow beam are studied in the third, forth and fifth chapters.
第三、四、五章是对空心光束的传输特性及奇点效应的研究。
The fourth and fifth chapters make investigation on the present condition of classroom questions and analyze the influence factor.
第四章和第五章对当前课堂提问的现状进行了调查并对其影响因素进行了分析。
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