The following is a paragraph from a n academic paper. Refinish writing to conform to academic style，improve spelling，grammar，clarity, conciseness and overall readability. If necessary, rewrite the entire sentence. In addition,list all modifications in the Markdown table and explain the reasons for doing so.Paragraph ：（+the paragraph that requires polishing）

    以下是一篇学术论文中的一段文字。请重新润色写作，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：（+润色内容）。