留学邮件的标题和称呼应体现出专业性、尊重和清晰性。以下是一些建议：
标题
标题应简明扼要，能够快速传达邮件的主要目的。例如：“Request for Meeting Regarding Thesis Feedback”或“Inquiry about Assignment Due Date”。
称呼
初次联系教授：使用“Dear Professor [Last Name]”或“Dear Dr. [Last Name]”。
熟悉教授：如果与教授关系较为熟悉，可以使用“Hi, [First Name]”或“Hello, [First Name]”。
学校部门：如果不确定具体联系人，可以使用“Dear Sir/Madam”或“Dear [Department Name] Team”。
正文
开头问候：根据与收件人的关系选择合适的问候语，如“Hope this email finds you well”或“I hope all is well”。
自我介绍：简要介绍自己，包括姓名、学号和专业等。
明确目的：开门见山地说明邮件的目的，让教授一眼就能明白邮件的重点。
结尾：表达感谢，并期待回复。例如：“Thank you for your time and I look forward to your response.”。
签名
签名应包括你的名字、职务和联系方式，以便教授需要时能够联系到你。
示例邮件
```
Subject: Request for Meeting Regarding Thesis Feedback
Dear Professor [Last Name],
I hope this email finds you well. I am writing to request a meeting to discuss the feedback on the first chapter of my thesis. I believe your insights would be invaluable in helping me improve the quality of my work.
I am a student in your [Course Name and Section] and my student ID is [Your Student ID]. I have attached a copy of the chapter for your review.
Thank you for considering my request. I am available at your earliest convenience and would prefer to meet sometime next week if possible.
Best regards,
[Your Full Name]
[Your Position]
[Your Contact Information]
```
通过遵循这些建议，你的留学邮件将更加专业、清晰，并且能够提高与教授沟通的效率。