Older Kindles won't do Chinese, and only a few Greek Characters etc that happen to be in the pre-installed Roman-Latin fonts.
Most newer Kindles will show which ever Chinese you embed in the epub (Amazon KDP takes epub2 uploads by preference), BUT only at all when the user selects Publisher fonts.
It's a simple reasonable question with no clear answer. Blame US centric software developers because this was a problem solved maybe 15 years before the first Sony ereader and nearly 20 years before a Kindle came out. Russian, Arabic, Hebrew, Thai, Korean, Hindi and Japanese has been a problem.
Most epub based devices have depended on Adobe (USA again) reader software.
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