According to Article 33 of the Law, applicants may modify their patent application documents. However, modifications to invention and utility model patent application documents shall not exceed the scope recorded in the original description and claims. For design patents, Modifications to application documents must not exceed the scope of the original images or photos. Explain that your modifications exceed the scope recorded in the original application description. You can add content to the background part, but the content you add must be content that has been disclosed before the filing date. Furthermore, the modifications you make must address the defects pointed out in the correction notice. If you make other modifications, they will generally not be accepted. For specific questions, you can QQ me at 1042226735