论文答辩结束时，导师或评委通常会用英语表达自己的观点和建议。以下是一些常见的结束语：

1. Thank you for your presentation. Your work is impressive and well-researched. I have a few suggestions for further improvement.

感谢您的演讲。您的工作令人印象深刻，研究也很充分。我有一些进一步改进的建议。

2. I appreciate the effort you put into this research. Your findings are valuable and contribute to the field. However, there are some areas that need more clarification.

我非常感谢您在这项研究中所做的努力。您的发现非常有价值，对该领域做出了贡献。然而，有些地方需要更多的澄清。

3. Your thesis is well-organized and presented. Your methodology is sound and your results are significant. I suggest you consider submitting it for publication.

您的论文组织得很好，呈现出色。您的方法论很合理，结果也很显著。我建议您考虑将其提交出版。

4. Your research is innovative and unique. I commend you for your hard work and dedication. However, there are some areas that require further exploration.

您的研究很有创新性和独特性。我赞扬您的辛勤工作和奉献精神。然而，有些地方需要进一步探索。

5. Overall, I am impressed with your thesis. You have demonstrated a deep understanding of the subject matter and have made a valuable contribution to the field. Congratulations on your hard work and success.

总的来说，我对您的论文印象深刻。您展示了对主题的深刻理解，并为该领域做出了宝贵的贡献。祝贺您的辛勤工作和成功。