给留学生写信时，可以遵循以下步骤和建议：

称呼

可以使用“Dear [Name]”或“Dear International Students”等通用称呼，如果知道具体姓名，使用“Dear [Full Name]”会更加亲切。

开场白

简短地介绍自己，表达写信的目的，例如：“I am writing to you as a fellow international student/as a professor in [University Name]”。

表达关心和支持

表达对留学生健康、学业和生活的关心和支持，例如：“I am deeply concerned about your health and safety during these challenging times”。

分享信息

如果有必要，可以分享一些关于学校、专业或当地生活的信息，例如：“Our university has been actively taking measures to prevent and control the epidemic”。

鼓励和交流

鼓励留学生保持积极的态度，分享自己的经验和感受，例如：“Learning is like rowing upstream； not to advance is to drop back”。

提供建议

如果适合，可以提供一些学术或个人发展的建议，例如：“It is important to stay focused and persistent in your studies”。

结束语

用温馨的结束语结束信件，例如：“Wishing you all the best in your academic and personal endeavors”。

签名

亲手签名，如果是电子邮件，可以直接打上自己的名字。

```

Dear [Name],

I hope this letter finds you well. As a fellow international student, I wanted to take a moment to express my support and concern for your well-being during these unprecedented times.

Our university has been actively taking measures to prevent and control the epidemic, and we are all closely monitoring the situation. It is important to stay informed and follow the guidelines provided by the authorities to ensure our safety.

I remember when I first started my studies abroad, I also faced many challenges, such as adapting to a new environment and culture. I found that staying positive and open to new experiences was key to overcoming these difficulties. I encourage you to do the same, and don't hesitate to reach out for help if you need it.

Your journey is an exciting one, and I am confident that you will achieve great things. Keep pushing forward, and remember that you are not alone in this.

Wishing you all the best in your academic and personal endeavors.

Sincerely,

[Your Name]

```

希望这些建议能帮助你写出一封温暖而有意义的信给留学生。