留学询问邮件的标题应该简洁明了，直接表达你的需求。以下是一些示例：
Inquiry about Application Status
Question about [Course Name] Assignment
Request for Extension for [Project/Assignment Name]
Inquiry about [Semester/Course] Attendance
Application for [Program/Graduate School] Admission
确保标题中包含关键信息，如你的姓名、申请ID、申请专业名称和入学年份，以便学校或教授能快速识别邮件内容。