Explain your own situation, about 300 words. It is recommended not to insert a documentary resume, and the teacher is probably too lazy to download it. You can add a resume to insert as a picture.
You can use the email address of 163, and it is best to register with your own phone, so that the teacher will call you if something happens. In addition, the 163 mailbox can check the read reply function before sending the email, that is, as long as the teacher clicks on your email, you will receive a reply. You can be sure whether the teacher has read your email.