It is best to know the teacher's professional field before sending an email.

Then say hello to the teacher and talk about the content, and then exchange greetings to narrow the distance.

Just write the specific content truthfully.

But you must respect teachers and use more people like you.

Praise the teacher's position or achievements in this field.

Then show your determination to follow him well.

If you have confidence in your grades, you can attach your resume (preferably pdf or 03).

Then remember to leave your name, phone number, email address and other contact information.