留学生可以用以下英文表达方式：
International Student
Foreign Student
Overseas Student
Student Abroad
Exchange Student
Students Abroad
Returned Students
Visa Students
Students Aboard
Foreign Exchange Students
Students Studying Abroad
选择哪个词汇取决于上下文和你想传达的精确含义。例如，如果你想强调学生来自国外，可以使用 "International Student" 或 "Foreign Student"；如果你想强调学生正在参与交换项目，可以使用 "Exchange Student" 或 "Studying Abroad"