核心句子一览：
提出观点： "A case in point is ..."，用具体例子来支持你的论点，让作文更有说服力。
转折关系： "However, the difficulty lies in..."，巧妙运用转折词，使文章层次更丰富。
总结前文： "As stated in the previous paragraph..."，回顾前文，增强文章连贯性。
表达遗憾： "But it's a pity that..."，恰当表达情感，使文章更贴近人心。
强调重点： "It can be said with certainty that..."，明确强调，让读者快速抓住要点。
更多实用句型：
* "As far as ...is concerned"，就某一话题展开讨论，使文章更聚焦。
* "It goes without saying that..."，不言而喻的事实，增强文章的说服力。
* "What calls for special attention is that..."，引导读者关注重点，提升文章深度。
表格汇总：
