Below is a paragraph from an academic paper. Polish the writing to meet the academic style,improve the spelling, grammar, clarity, concision and overall readability. When necessary, rewrite the whole sentence. Furthermore, list all modification and explain the reasons to do so in markdown table. Paragraph ：XXX

    以下是一篇学术论文中的段落。请润色写作以符合学术风格，提高拼写、语法、清晰度、简洁性和整体可读性。如有必要，重写整个句子。此外，请在Markdown表格中列出所有修改，并解释修改的原因。段落：XXX