After receiving the application for retrial, the High Court kicked the materials to the Intermediate People's Court, and the Intermediate People's Court gave you a letter of explanation after self-examination, indicating that the Intermediate People's Court was not wrong. If you accept the letter of explanation, it means giving up the retrial application.
If you don't accept it, you will still re-apply to the High Court within 6 months and say that you can't accept the letter of explanation from the Intermediate People's Court.