The first chapter of "X in the" topic sentence, the nature, type and common now.
第一章主要分析“X于”话题句的性质、类别与共现。
参考来源 - 话题标记“关于”、“对于”、“至于”研究·2,447,543篇论文数据,部分数据来源于NoteExpress
N a sentence in a paragraph that expresses the main idea or point of the whole paragraph (段落)主题句
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