1. First of all, the spokesperson guarantees that the masks he endorses meet the relevant quality standards and can effectively protect against viruses and bacteria.

2. Secondly, spokespersons should pay attention to scientificity and objectivity when promoting products, and must not make false propaganda or mislead consumers.

3. Finally, the spokesperson should abide by the relevant national laws and regulations, and must not violate the advertising law and other relevant laws and regulations.