As of October 2018, there have been cases where Teachme Biz was accessible from Hong Kong and Beijing.
However, since whether access is available from all of China or only from certain regions is subject to the judgment of Chinese authorities, we cannot guarantee that access will always be possible.
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Related: Does Teachme Biz support foreign languages?
https://help.teachme.jp/hc/en-us/articles/900005509926