How to solve the garbled code in Mac python pandas plot drawing?

when drawing with pandas plot, the Chinese displayed is garbled in squares. The
code is as follows:

clipboard.png

clipboard.png

:
clipboard.png

how do you solve this problem?
tried online methods such as:
download SimHei.ttf fonts
loaded into the folder under matlablib ttf
and add three lines of code settings in the code can not make its normal display of Chinese
hope to get answers from all the bigwigs.

Mar.09,2021
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