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三种句子在文章中具有特殊位置,它们是文章开头第一句、自然段第一句(或只有一句的自然段)、文章最后一句。虽然文章篇篇面目不同,
The three sentences have special positions in the article. They are the first sentence at the beginning of the article, the first sentence of the natural paragraph (or the natural paragraph of only one sentence), and the last sentence of the article. Although the articles are different,