legal ground
Article 28 of the Trademark Law of People's Republic of China (PRC)
The Trademark Office shall, within nine months from the date of receiving the application documents for trademark registration, complete the examination of the trademark applied for registration. If it meets the relevant provisions of this Law, it shall make a preliminary examination and make an announcement.
Article 29
In the course of examination, if the Trademark Office considers that the contents of the application for trademark registration need to be explained or modified, it may require the applicant to make explanations or modifications. If the applicant does not make explanations or amendments, it will not affect the examination decision of the Trademark Office.