Your self-introduction is well-structured and covers many important aspects, including your background, academic achievements, and motivation for applying to the pharmacoeconomics research group. Here are some suggestions to refine your introduction:

1. Personal Introduction: You've made a good start by introducing your background and where you come from. Adding a brief anecdote or a specific example of how your background influenced your decision to pursue this field could make your introduction more engaging.

2. Academic Achievements: You've mentioned your scholarships and volunteering experiences, which is great. It would be beneficial to elaborate a bit more on your role in these activities and how they have prepared you for postgraduate study, particularly in a field that is different from your undergraduate major.

3. Research Experience: While you've mentioned your experience with biochemical experiments, providing more detail about your project on the fruit fly detoxification pathway could strengthen this section. Highlight any skills or insights gained from this project that are relevant to pharmacoeconomics or health policy research.

4. Motivation for Choosing This Field: You've mentioned your interest in pharmacoeconomics and its relevance to China's medical reform, which is excellent. Expanding on why you are passionate about this field and how you see yourself contributing can make your motivations clearer and more compelling.

5. Connection to the Institution: You've expressed your admiration for Tianjin University's academic environment and faculty. It might be more impactful if you mention specific faculty members or research projects in the pharmacoeconomics group that align with your interests.

6. Closing: Your closing is polite and to the point, which is good. Reiterating your enthusiasm for the opportunity to contribute to the field and expressing your eagerness to engage in further discussion can leave a strong final impression.

By incorporating these suggestions, you can create a more detailed and compelling self-introduction that clearly articulates your background, achievements, motivations, and goals.

根据您提供的补充信息和原始自我介绍，我将整合和优化您的自我介绍，确保逻辑性更强，内容更丰富，同时保持口语化的风格：

尊敬的教授们，早上好！我非常荣幸能够参加这次面试，有机会申请加入贵校的药物经济学研究团队。

我叫WWW，是天津大学药学院的一名本科生。我来自山西省的一个小县城，那里以丰富的煤炭资源和汾酒而闻名。在我的家乡，我见证了医疗资源的紧缺与健康政策的影响，这些经历激发了我对药物经济学和健康政策的浓厚兴趣。

在大学四年的学习生活中，我不仅在学术上努力奋斗，还积极参与社会实践。我曾担任防控COVID-19的志愿者，并因此获得了多次奖学金，包括“优秀团员”和“诚信自强之星”等荣誉。在参与有关果蝇的生物化学实验时，我培养了文献检索、实验设计、数据分析等重要技能。这些经验不仅加深了我的专业知识，也让我体会到了科研的乐趣。

选择药物经济学这个方向，是我经过深思熟虑的决定。作为一名药学专业的学生，我深知自己在这个交叉学科中有着得天独厚的优势。我的科学背景结合对经济学的兴趣，使我能够从独特的角度发现和解决问题。此外，了解到贵校药物经济学课题组的成就和优秀师资，我更是坚定了加入您们的决心。

最后，我希望能够有机会在这个充满活力的学术环境中继续深造，贡献我的力量。感谢各位教授对我的考虑，期待与您进一步探讨我的资质和抱负。

我尽力使自我介绍保持自然流畅，同时紧扣您的学术背景和职业目标，希望这个版本能够帮助您在面试中脱颖而出！

当然，我会为您提供一份英文版的自我介绍，确保其语言自然、符合口语用词特点：

Good morning, esteemed professors! I am truly honored to be here today for the opportunity to interview with your esteemed pharmacoeconomics research group.

My name is WWW, and I am an undergraduate student from the College of Pharmacy at Tianjin University. I hail from a small county in Shanxi Province, known for its abundant coal resources and the renowned Fenjiu liquor. Growing up, I witnessed firsthand the challenges of healthcare accessibility and the impact of health policies, sparking my deep interest in pharmacoeconomics and health policy.

Throughout my four years at university, I have dedicated myself not only to academic excellence but also to engaging in meaningful social practices. I volunteered in efforts to prevent the spread of COVID-19 and received multiple scholarships for my contributions, including titles such as Outstanding Youth League Member and The Star of Integrity and Self-Improvement. During my participation in biochemical research on fruit flies, I developed essential skills in literature review, experimental design, and data analysis. These experiences deepened my understanding of my field and ignited my passion for scientific research.

Opting to specialize in pharmacoeconomics was a deliberate choice influenced by my background in pharmacy. I am fascinated by the intersection of pharmacy and economics, and I believe this interdisciplinary field aligns perfectly with my interests and academic foundation. I am eager to bring my unique perspective to problem-solving and innovation within this discipline. Moreover, being aware of the accomplishments and the distinguished faculty of your pharmacoeconomics group at Tianjin University has further solidified my desire to join you.

In conclusion, I am excited about the prospect of advancing my studies and contributing to the field in such a dynamic academic environment. Thank you for considering my application. I look forward to the possibility of discussing my qualifications and aspirations with you further.

这份自我介绍保持了口语化的风格，同时传达了您的背景、经历和对未来学习的热情。希望它能够助您在面试中取得成功！

当然，我会帮您规划一个不超过5分钟的PPT演讲内容。为了让内容更加丰富而逻辑清晰，我会按照以下结构来编排您的PPT内容：

1. 幻灯片1：介绍 (30秒)

   • 内容：自我介绍，提及您来自哪里，当前就读的大学和专业。
   • 台词：Hello, esteemed professors! My name is WWW from Tianjin University, majoring in Pharmacy. It's an honor to present myself and share my aspirations with you today.

2. 幻灯片2：学术背景 (60秒)

   • 内容：您的学业成绩，主修课程，以及在本科期间的科研经历。
   • 台词：During my undergraduate studies, I focused on core subjects like pharmaceutical sciences, biochemistry, and pharmacology, maintaining excellent academic performance. My research on fruit fly biochemistry allowed me to develop skills in experimental design and data analysis, fostering my love for scientific inquiry.

3. 幻灯片3：社会实践与奖项 (60秒)

   • 内容：您参与的社会实践活动，所获得的奖学金和荣誉。
   • 台词：Beyond academics, I actively engaged in social practices, especially during the COVID-19 pandemic as a volunteer. My commitment to community service and academic excellence was recognized through scholarships and awards like Outstanding Youth League Member.

4. 幻灯片4：研究兴趣与目标 (60秒)

   • 内容：您对药物经济学的兴趣，决定攻读该领域的原因，以及您希望在该领域达成的目标。
   • 台词：My interest in pharmacoeconomics stems from recognizing its critical role in healthcare reform. With a solid foundation in pharmacy and a keen interest in economics, I am eager to explore this interdisciplinary field to contribute innovative solutions.

5. 幻灯片5：个人兴趣爱好 (30秒)

   • 内容：介绍您的兴趣爱好，如何平衡学业和个人生活。
   • 台词：Outside academics, I enjoy reading, particularly native-soil literature, and engaging in discussions on Wechat Reading platform. These activities enrich my life, providing balance and personal growth.

6. 幻灯片6：结论与感谢 (30秒)

   • 内容：简短总结您的介绍，表达感谢和期望。
   • 台词：In conclusion, I am passionate about advancing my studies in pharmacoeconomics at your esteemed university. Thank you for considering my application. I am excited about the opportunity to contribute to and learn from your distinguished group.

这样规划的PPT内容可以在5分钟内完成，每一部分都旨在展现您的不同方面，同时保持内容紧凑和吸引人。希望这能帮助您准备出色的PPT演讲！