Hi Honghai Chen,
Thank you for reaching out to us on Microsoft Q&A forum.
"We’re glad to hear that your issue has been resolved."
For a clearer understanding, please review the categories of Azure Cognitive Services:
https://learn.microsoft.com/en-us/azure/architecture/data-guide/technology-choices/cognitive-services#categories-of-azure-cognitive-services
If the information is helpful, please Accept Answer so that it would be helpful to community members.
Thank you.