2. Date: Write down the date of the letter of understanding to record the time of the incident.
3. Recipient information: Write down the recipient's name, position, address and other relevant information.
4. Address: According to the identity of the recipient, write down the appropriate address, such as "Dear Sir/Madam".
5. Introduction: At the beginning of the letter of understanding, briefly state the background and reasons of the incident, which can express the importance and regret of the incident.
6. Apologize: sincerely apologize for your mistakes or mistakes, admit your mistakes, and express regret.