How to add the Chinese to the autocomplete dic ?

I make a MarkDown dic for my MarkDown snippet in the MarkDown file. The English word works fine. But if I add some Chinese vocabulary in the markdown.txt, it doesn't work.
How to fix this question ?

I haven't find the answer on the Google

vimrc:
function AddMarkDownDict()
if g:isWIN
set dict+=$VIM/vimfiles/dict/markdown.txt
else
set dict+=~/.vim/dict/markdown.txt
endif
set complete+=k
endfunction

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