Hi Guoxuefeng,
Thank you for your update.
We have checked the provided PowerPoint presentation, please find the details as below:
We are able to reproduce the scenario “Chinese content in PowerPoint Presentation is missing while PDF conversion”.
A support incident to track the status of this defect has been created under your account. Please log on to our support website to check for further updates
Please let me know if you have any question.
Regards,
Devisri