2. theme. It is the core part of the reply. It is necessary to clearly explain the other party's questions and opinions in concise and decent language, so that the other party can quickly understand the intention of the letter, accurately reflect and write clearly after receiving the letter.
3. It's over. Generally, we will reply to each other in polite language, such as giving support, help or cooperation, or putting forward hopes and demands. The concluding remarks are generally idioms such as "this reply" and "I hereby reply"