It 's not fair! They are original photos from the author, but it can not be properly displayed in this article. It may be because of Steemit 's protocol. These photos can be properly displayed in Bitkan's website. For details, you can check the following link:
https://bitkan.com/zh/article/blog/40362?uid=6417683&from=android&utm_campaign=APPShare&utm_source=android&utm_content=40362&utm_medium=blog&bkfrom=appshare&bktarget=copylink